HAIR PRODUCT DISTRIBUTION METHODS AND SYSTEMS

Abstract

The present invention relates to a hair treatment product dispensing system comprising a dispenser receiving at least two cartridges, each having a reservoir and containing first and second coloring and / or perming and / or straightening products. The dispenser allows for the delivery of the mixture in adjustable proportions. Optionally, the invention includes a device for dispensing the mixture(s) and a device for applying the mixture. The present invention also relates to a hair coloring process that includes supplying a coloring mixture made from at least two coloring products, applying this mixture to an inconspicuous area of ​​the hair, selecting the desired color, and selecting a coloring product corresponding to the desired color.

Description

1. METHODS AND SYSTEMS FOR DISTRIBUTING HAIR PRODUCTS The present invention relates to methods and systems for distributing, in particular, hair products, preferably coloring products. It is known to dye keratin fibers, and in particular human hair, with dye compositions containing oxidation dye precursors, generally called oxidation bases, such as ortho- or paraphenylenediamines, ortho- or paraaminophenols, and heterocyclic compounds. These oxidation bases are colorless or weakly colored compounds which, when combined with oxidizing agents, give rise, through an oxidative condensation process, to colored compounds.It is also known that the shades obtained with these oxidation bases can be varied by combining them with color couplers or modifiers. These couplers are chosen from among aromatic metadiamines, metaaminophenols, metadiphenols, and certain heterocyclic compounds such as indole compounds. The variety of molecules involved in the oxidation bases and couplers allows for a rich palette of colors. This oxidation coloring process consists of applying oxidation bases, or a mixture of oxidation bases and couplers, to keratin fibers with an oxidizing agent, such as hydrogen peroxide. The mixture is left to set, and then the fibers are rinsed. The resulting colors are permanent, vibrant, and resistant to external agents, including light, weathering, washing, perspiration, and friction.Generally applied at a basic pH, this process allows for both dyeing and lightening of the hair fiber, which in practice results in a final color lighter than the original. Furthermore, lightening the fiber has the advantageous effect of creating a uniform color in the case of gray hair, and in the case of naturally pigmented hair, of enhancing the color, making it more visible. Dyeing keratin fibers using direct coloring is also known. The classic direct coloring process involves applying direct dyes—colored molecules with an affinity for the fibers—to the keratin fibers, allowing the dyes to process, and then rinsing the fibers.It is known, for example, to use direct dyes of the benzene, anthraquinone, and nitropiridine types, as well as azo, xanthenic, acridinic, azinic, and triarylmethane dyes. The resulting colors are particularly chromatic, but they are temporary or semi-permanent because the nature of the interactions that bind the direct dyes to the keratin fiber, and their desorption from the surface and / or core of the fiber, are responsible for their low coloring power and poor resistance to washing or perspiration. These direct dyes are also generally sensitive to light due to the low resistance of the chromophore to photochemical attacks, and over time, this leads to a fading of the hair color. Furthermore, their sensitivity to light is dependent on their uniform distribution or their distribution in aggregates within the keratin fiber.It is known to use direct dyes in combination with oxidizing agents. However, direct dyes are generally sensitive to the action of oxidizing agents such as hydrogen peroxide, and reducing agents such as sodium bisulfite, which generally makes them difficult to use in direct lightening dye compositions based on hydrogen peroxide and an alkalizing agent, or in oxidation dye compositions in association with precursors such as oxidation bases or couplers. Many people want to color their hair to enhance their appearance. They generally want to either cover gray hair or change their hair color. Hair coloring products are marketed to consumers with descriptions of the expected visual results. However, it's difficult to provide a precise description because many factors influence the final result: 1) The condition of the hair. Indeed, depending on the hair's type and history, the penetration and retention of dyes, and therefore the color result, will vary. 2) The initial hair color. This initial color is linked to the amount of melanin present in the hair. Depending on this melanin level, the lightening process, which precedes hair coloring, produces different levels of blonde. 3) The type of melanin. Depending on its type, the lightening process results in different final colors, with varying degrees of orange undertones.Ideally, the person has an idea of ​​the color they want to achieve in their hair. From there, they try to find the product that will give them the desired color. Depending on the coloring product chosen, experience shows that the results obtained can be far from the expected outcome, sometimes being blonder, darker, more intensely colored, lighter, or a different color altogether. Conversion systems exist to better describe the expected result based on the original hair color. However, it is very difficult to deduce which product to use from these. Furthermore, it is very difficult to remove the color obtained if it does not match the desired color. Even if this possibility exists, it does not allow for an exact return to the original color. The user can try applying another coloring product or, if the applied coloring is permanent, wait for the hair to grow out. These difficulties lead people who wish to color their hair to cover gray hair or change their color,to sometimes forgo hair coloring or not dare to change their color. As a result, these people do not fully benefit from the wide range of colors available in coloring products. According to one aspect, the invention aims to solve this problem and relates to a hair coloring process that consists of applying a multitude of coloring products to a limited and preferably inconspicuous area of ​​the hair, then, in a second step, selecting from among the applied products the one that gives a color result close to the desired one, and finally applying this product to the entire head of hair. According to another aspect, the invention relates to a coloring product dispensing system comprising at least two compartments, each compartment containing at least one coloring product, the system allowing the preparation of at least two mixtures that are then applied to one or more areas of the hair.preferably on inconspicuous areas or on strands that are cut 20 minutes after the final coloring of the entire head of hair. Coloring products are defined as: - Compositions containing direct or oxidative dyes - Compositions containing oxidants such as hydrogen peroxide, persalts (persulfates, perborates, etc.) 25 - Compositions containing agents capable of influencing coloring or the action of oxidants: alkaline agent, acidic agent, neutralizing agent, or uncolored / coloring product to allow the dilution of compositions containing dyes and / or oxidizing agents. "Mixed products" are defined as a coloring product resulting from the mixing of at least two coloring products. For example,The mixture product may be: - A composition containing oxidation dyes + a composition comprising an oxidizing agent with or without an alkali or acidic agent - A composition containing several oxidation dyes 3052032 4 - A composition containing direct dyes + an oxidizing agent with or without an alkali or acidic agent - A composition containing direct dyes with or without an alkali or acidic agent 5 - A composition containing oxidants with or without an alkali or acidic agent Preferably,A two-compartment system is used, in which the following are placed: 1) A composition containing oxidation dyes with or without an alkali agent and / or direct dye; 2) A composition containing one or more oxidants. Or 1) A composition containing oxidation dyes with or without an alkali agent and / or direct dye + one or more oxidants. 2) Another composition containing oxidation dyes with or without an alkali agent + oxidant, the two compositions being different in terms of the nature and / or concentrations of oxidation or direct dyes and / or the level of alkali agent and / or the level of oxidant. Or 1) A composition containing oxidation dyes with or without an alkali agent or direct dye + one or more oxidants, and 2) A neutral composition (without dye or oxidant). According to another embodiment,A three-compartment system is used, in which the following are placed: 1) A composition containing oxidation dyes with or without an alkali and / or direct dye; 2) A second composition containing oxidation dyes with or without an alkali and / or direct dye, the two compositions being different in terms of the nature and / or concentrations of oxidation dyes and / or the level of alkali; and 3) A composition containing an oxidant. Or: 1) A composition containing oxidation dyes with or without an alkali and / or direct dye + one or more oxidants; 2) Another composition containing oxidation dyes with or without an alkali and / or direct dye + one or more oxidants; 3) Another composition containing oxidation dyes with or without an alkali and / or direct dye + oxidant.The three compositions differ in the nature and / or concentrations of oxidation dyes and / or direct dye and / or the level of alkali and / or oxidant. Or: 1) A composition containing oxidation dyes with or without an alkali and / or direct dye + one or more oxidants, 2) Another composition containing oxidation dyes with or without an alkali and / or direct dye + one or more oxidants, 3) A neutral composition (without oxidant or dye). The system is then used to deliver a set of mixture products from the different compartments. For example, with the two-compartment system, six mixture products can be made, such as 0 / 100 (0% of the product from the first compartment and 100% of the product from the second compartment), 20 / 80, 40 / 60, 60 / 40, 80 / 20, 100 / 0. In another step,Preferably, immediately after dispensing all the mixing products, one or more areas of the hair, such as 1 mm² to 4 cm², preferably 4 mm² to 1 cm², are treated with these mixing products. To perform this application, the mixing products can be applied to the hair using the mixing device as an application tool. Alternatively, the mixing products can be applied to a support that is then applied to the hair. Preferably, application is made to areas with low exposure, such as the interior of the hair. Application can also be made to the ends, including trimmed and collected ends or ends intended for trimming. Typically, each mixing product contains 10 mg to 1 g, preferably 50 mg to 500 mg. After application, the mixing products are left on the hair for approximately 20 to 40 minutes.or according to an accelerated process, for example, 5-10 minutes, representative of what would be obtained with a normal processing time. For example, the accelerated process may include the following steps: 5 a) Heat the area(s) of the hair (approximately 40-60°C or higher) b) Or heat the entire head of hair c) Or perform a mathematical adjustment on the resulting color to approximate the result that would have been obtained with a standard processing time. 10 At the end of the treatment, rinse or leave on; in the latter case, it is necessary to dry the application area. Then, evaluate the color obtained for each product in the mixture to choose the result considered closest to the desired outcome for the person coloring their hair. From there,The selected product can be applied to the entire head of hair. Alternatively, a set of results considered close to the desired color can be chosen to determine the product or mixture of products to use on the entire head of hair. To help the user choose the best result, the colored areas can be magnified. This allows the user to better visualize the colors, facilitating their choice. A computer simulation system can also be used, displaying different colors on a swathe of hair on the screen. To aid in the selection process, the screen can display the person's face with their hair in various colors. The person and their hair can be presented in different scenarios to further assist: choosing clothing in specific or varied colors, choosing backgrounds, etc. The system can display the different colors side by side.or sequentially. It can also suggest intermediate colors that have not been produced but that the system can interpolate or extrapolate based on the colors produced. For example, if we have put in a two-compartment system: Compartment 1: A composition containing X mol% of paraphenylenediamine and X mol% of resorcinol + 8 volumes of hydrogen peroxide + 5% of 10% ammonia 3052032 7 Compartment 2: A composition containing 5X mol% of paraphenylenediamine and 5X mol% of resorcinol + 8 volumes of hydrogen peroxide + 5% of 10% ammonia Then, we delivered 3 portions (200 mg each) with concentrations of 100 / 0, 50 / 50 and 0 / 100. 5. Then, after 30 minutes, we rinsed and determined that the best result should be between 100 / 0 and 50 / 50. It is then possible to display on the screen the simulated colors that a 75 / 25 mixture would have produced. If the user likes this color,A product containing 2X mol% of paraphenylenediamine and 2X mol% of resorcinol + 8 volumes of hydrogen peroxide + 5% ammonia at 10% will be recommended, as it is an intermediate between a 100 / 0 and a 50 / 50 ratio. In a preferred embodiment of the invention, the system automatically prepares a series of mixture products (preferably between 4 and 20). Then, after application, rinsing, drying, (and possible correction if an accelerated process with a reduced processing time is used), a photograph of the result is taken under specific lighting, representative of the viewing conditions. The photograph is then analyzed, and the system produces a series of hair color simulations on a screen. After selecting the desired color on the hair of the person wishing to color their hair,The system will indicate the product to use or the products to mix. The coloring product is then applied to the entire head of hair. 20 The choice of compositions to use in the system depends on the type of color desired. For example, if the desired color is red, it will place compositions in the compartments that produce colors in the red family. The same method is applied for hair bleaching by adjusting 25 the nature and / or quantity of oxidizing or bleaching agents. In a particular embodiment, the system is informed of the nature of the products placed in the compartments. By doing so, the system can, for example, suggest the product to use or the mixture of products to prepare from a list or a commercial catalog. 30 In this case, a screen can display,Simulations of the different colors that can be obtained by mixing the products are displayed. For example, a color range is shown as a triangle, and the user chooses the color obtained from the mixtures. There is almost certainly a difference between the simulation and the actual color resulting on the hair. Once the user has performed tests, the system will have a better understanding of hair behavior and will then be able to suggest more realistic colors. Thus, the system can be used in a new cycle: the user displays colors on the screen, chooses one or a few, and then mixes the colors for another test and selection session. The coloring product may contain one or more direct dyes, which can be chosen from among the nitrate dyes of the benzene series.Cationic direct dyes, azo direct dyes, and methine direct dyes may be used. The dyeing product may contain an oxidizing agent. This oxidizing agent may be any oxidizing agent conventionally used for bleaching keratin fibers. The oxidizing agent is preferably chosen from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts such as perborates and persulfates, peracids, and oxidase enzymes. The use of hydrogen peroxide is particularly preferred. The dyeing product may contain an oxidizing base. This oxidizing base may be chosen from those conventionally used in oxidative dyeing, for example, paraphenylenediamines, bisphenylalkylenediamines, and para-aminophenols.Ortho-aminophenols and heterocyclic bases. The coloring product generally contains a dye carrier consisting of water or a mixture of water and at least one organic solvent to solubilize compounds that would not be sufficiently soluble in water. Examples of organic solvents include lower Cl-C4 alkanols, such as ethanol and isopropanol; polyols and polyol ethers such as 2-butoxyethanol, propylene glycol, propylene glycol monomethyl ether, diethylene glycol monoethyl ether and 25-diethylene glycol monomethyl ether; and aromatic alcohols such as benzyl alcohol or phenoxyethanol, and mixtures thereof. The solvents may preferably be present in proportions of approximately 1 to 40% by weight relative to the total weight of the dye composition.and even more preferably between 5 and 30% by weight approximately. 30 The coloring product may also contain various adjuvants conventionally used in hair dyeing compositions, such as anionic, cationic, non-ionic, amphoteric, zwitterionic surfactants or mixtures thereof, anionic, cationic, non-ionic, amphoteric, zwitterionic polymers or mixtures thereof, mineral or organic thickening agents, and 35 in particular associative thickeners of anionic, cationic, non-ionic and amphoteric polymers, antioxidants, penetration agents, sequestering agents, perfumes, buffers, dispersing agents, conditioning agents such as, for example, volatile or non-volatile, modified or unmodified silicones, film-forming agents, ceramides, preservatives,Opacifying agents. These adjuvants mentioned above are generally present in quantities ranging from 0.01% to 20% by weight of each, relative to the weight of the coloring product. Examples of acidifying agents that may be used in coloring products include mineral or organic acids such as hydrochloric acid, orthophosphoric acid, sulfuric acid, and carboxylic acids such as acetic acid, tartaric acid, citric acid, lactic acid, and 10-sulfonic acids. Examples of alkaline agents that may be used in coloring products include ammonia, alkali carbonates, and alkanolamines such as mono-, di-, and triethanolamines, as well as their derivatives.Sodium or potassium hydroxides and compounds of the following formula (III): 15 / R6\ R8 NWN (III) R( R9) in which W is a propylene residue optionally substituted by a hydroxyl group or a Cl-C4 alkyl radical; R6, R7, R8, and R9, whether identical or different, represent a hydrogen atom, a Cl-C4 alkyl radical, or a C1-O4 hydroxyalkyl radical. The coloring product may be in various forms, such as liquids, creams, gels, or any other form suitable for dyeing keratin fibers, particularly human hair. Dispensing System The dispensing system may consist of a single, self-contained device, preferably one-handed,or by a device that operates by interacting with other parts or devices. This could be, for example, different output interfaces mounted on a dispenser to apply product mixtures one after another or in series. It could also be a computer system that exchanges information with the dispenser to control it, this computer system including, for example, a portable terminal such as a smartphone, a camera phone, a tablet, a personal computer, or a dedicated terminal. Preferably, the dispenser is arranged to pressurize one or more compartments containing the base product(s) by means of volumetric dosing devices, preferably a motor driving a piston in the corresponding compartment. The dispenser can consist of a housing and at least two or three compartments, and preferably the same number of motors. For example,The rotation of the 5 motors drives worm gears, which push the pistons in each compartment. The piston advance is controlled, for example, by the number of control pulses sent to the motors and / or by their operating time. The motors can be powered sequentially, or preferably simultaneously. 10 For example, the motors are powered for a short time during a basic operating cycle, one after the other, or simultaneously, so as to distribute corresponding microdoses. The basic cycles are repeated, possibly with a pause between them, which allows time for the raw materials to flow out of the compartments. 15 The compartments can be defined by cartridges that are removed when empty. Alternatively,The compartments are permanently installed and refilled once empty. Each cartridge can be closed with a removable cap to allow for cleaning. 20 Preferably, the dispenser housing is elongated along a longitudinal axis, which can facilitate handling, and the cartridges are arranged around this axis within the housing. Preferably, the cartridges are installed from the rear, and the mixture is delivered from the front. The cartridges can be installed individually, or 25 alternatively, the cartridges form a single unit when installed. Each cartridge may include a volumetric dosing mechanism, comprising a piston driven by a dispenser drive mechanism.in a direction accompanied by a decrease in the internal volume containing the base product and an expulsion of the product. It may be advantageous for the cartridges 30 to have at least one region of their wall that is transparent, in order to allow the color of the product contained inside to be seen. The drive mechanism may include a motorization system consisting of motors coupled to gearboxes, elongated in shape parallel to the longitudinal axis of the dispenser, and arranged between the cartridges. This positioning of the motors and 35 cartridges makes the dispenser particularly compact. 3052032 11 The base product can exit the corresponding cartridge in a sealed manner and then flow through a channel provided for this purpose in the dispenser housing, before exiting it. The cartridges advantageously terminate with a nozzle made in such a way that, once the cartridge is inserted into the dispenser housing,The tip of the nozzle opens flush with the housing. Alternatively, the nozzle is long enough to extend beyond the housing, thus connecting various outlet interfaces that can be attached to the dispenser housing. Thanks to the drive mechanism, which includes motors to advance 10 pistons, it is possible to precisely dispense mixtures in very small quantities. Thus, base products can be dispensed at flow rates as low as 10 pL / s, and preferably at flow rates ranging from 20 to 100 pL / s. It is therefore easy to prepare a mixture of approximately 10 mg. Such a dispensing system is ideal for applying small touches of makeup, for example, to cover a small area of ​​1 cm² or less. It is also possible to prepare larger quantities of mixture, such as those needed to color a section of hair. The invention thus aims to,According to one of its aspects, a dispensing system includes a dispenser having a housing, and at least one cartridge 20 received in the dispenser housing, this cartridge having a body and a piston movable within the body, the housing having a motorized drive mechanism for moving the cartridge piston. Preferably, the cartridge has a dispensing nozzle through which the product is dispensed, and this dispensing nozzle is driven in rotation by the drive mechanism 25 to move the piston. The nozzle may have at least one anti-rotation relief, preferably two diametrically opposed anti-rotation lugs. The nozzle may have a sealing ring, in particular an O-ring. Thus, when changing the cartridge, the seal is also changed, which eliminates the risk of seal wear. 30 The dispenser may include an electronic control board for the motorized drive mechanism,This electronic board is traversed by the nozzle(s). This allows for a board extending substantially over the entire cross-section of the dispenser, thus grouping all the electronic components of the dispenser onto a single board, thereby improving compactness and reliability. The board can extend 35 substantially perpendicularly to the longitudinal axis of the housing. The board can include a switch to control the dispenser's operation. 3052032 12 The dispensing system can be configured to operate in at least two dispensing modes. In the first mode, called "continuous," the mixture is dispensed as long as pressure is applied to the control switch. 5 In the second mode, called "dosing," a predefined quantity of the mixture is dispensed with each press of the switch. The nozzle(s) can open at one end of the housing. This can reduce dead space,as will be detailed later. The nozzle(s) may have a sealing system 10 at their end to prevent the products from drying out in the conduit, for example, a healing membrane. The cartridge may have a hollow screw onto which the piston is screwed; the piston can move axially on the screw when the screw rotates. The piston is prevented from rotating within the cartridge body. For example, the friction of the piston on the cartridge body may be sufficient to prevent it from rotating when the screw rotates. Preferably, rotation is prevented with a cartridge body of non-circular cross-section and a non-deformable piston. The motor torque can be determined electronically as a function of the current drawn and used, for example, to detect the end of the piston stroke. 20 information concerning the torque can be transmitted remotely to a computer system with a human-machine interface.to allow monitoring of the dispenser's proper operation. In order to adjust the shade, the dispensing system according to the invention must allow the user to vary the volume dispensed from each compartment. Preferably, the dispenser is controlled by a computer system, which is either integrated into the dispenser or external to it, the dispenser then being capable of exchanging information with the computer system via wireless or wired protocol. The dispenser can thus be controlled to allow adjustment of the shade by simultaneous or sequential, and controlled, dispensing of several basic products of 30 different colors. The dispensing of the basic products can be continuous; in this case, the volumes of each of the basic products are dispensed in a single pass, simultaneously or successively. In the case of simultaneous dispensing,It is useful to be able to adjust the respective flow rates of the different base products so that the distributed mixture corresponds to the desired one at any given time. Such a distribution method can be particularly suitable when distributing the mixture by spraying, using an airbrush. To adjust the flow rates, it is possible, for example, to vary the speed of the pistons' movement; for instance, in the case of pistons driven by a worm gear, by varying the rotational speed of the motors driving the screw. The products can also be distributed in pulses with a dispensing time and a pause time of 5 per cycle. By adjusting the duty cycle, it is possible to control the flow rate. All products can be delivered simultaneously during the dispensing time; alternatively, the cycles of the different products are staggered.so that a product is dispensed while other products are not being dispensed. In a particular embodiment of the invention, the mixture is delivered into a cavity in a container, which may or may not be hermetically sealed, for example, cup-shaped, into which an applicator, in particular a stylus or brush, can be slid. Such a dispensing system is especially suited to liners, glosses, and other formulas applied without direct hand contact. This container may be removable. When it is not removable, the container may be made from the body of the dispenser. When it is removable, it may constitute one outlet interface among others that may be mounted on the dispenser. The compartments, and in particular the cartridges, may contain all or part of the drive mechanism, and for example, the motorization system, or better yet, part of the motorization system, and this,in order to reduce the number of moving parts 20 in the distributor body outside the cartridges. For example, the cartridges contain the motor rotor. Once the cartridges are installed in the distributor body, the rotors interact with the stators. The dispensing system is advantageously arranged to allow the execution of pre-programmed sequences in which the mixture delivered is modified continuously or discontinuously. A "gradient" mode, for example, allows a gradual transition from mixture A to mixture B. In the case of spray application, particularly with an airbrush, this makes it easy to create gradients. One mode allows, for example, the offering of several successive pre-programmed mixtures, with the computer system indicating to the user each time how to use it, for example, by displaying it on a screen. In the case of manual application,The mixtures are dispensed, for example, into a small cup. The person applies the corresponding mixture taken from the cup, then cleans the cup if necessary and requests the dispensing of a new mixture; the operation is repeated several times. 35 The homogenization of the dispensed mixtures can be carried out in different ways depending on the use case. In the case of manual application, it can be done directly on the application area at the time of application or in the cup 3052032 14 before dispensing; in the case of airbrush application, the airbrush nozzle serves as the mixing chamber; in the case where the mixture is dispensed into a container for later use, homogenization can be done manually or by passing the dispensed products through a mixing chamber, located 5 between the dispenser and the container or directly integrated into the container.as detailed below. The product can be dispensed by the dispensing system and used immediately. 10 Continuous use for creating gradient blended products. In this application, the dispensing system, while dispensing the blended product, changes the formulation of the mixture. Furthermore, the outlet of the base products or the mixture is moved relative to a container or support defining an application surface. In a particular embodiment of the invention, the 15 dispensing system is arranged to calculate the evolution of the mixture based on color C1, of one area to be treated, and color C2, of another area to be treated. Subsequently, the user will assess the result obtained with this gradient. They will identify the desired hair color. Then,The system will be able to indicate to the user the product to use or the mixture of products to prepare and then apply to the entire 20 hairs. Mixer integrated into the outlet interface. There is an advantage to having a dispensing system capable of delivering a mixture that can be easily used, in particular dispensed by the user, 25 without requiring any additional mixing action on their part. According to one of its aspects, independently or in combination with the other aspects thereof, and in particular the foregoing, the invention relates to a dispensing system comprising a dispenser having outlet channels for base products and an outlet interface separable from the dispenser, this interface having a static mixer 30, preferably dispensing the mixture into a cavity where it can be dispensed. Preferably,The static mixer comprises a central chamber communicating with feed channels for the raw materials. This central chamber may communicate with a peripheral chamber comprising a series of partitions that act as deflectors for the mixture and create a shear force. The peripheral chamber may include a perforated annular partition defining openings through which the mixture passes as it circulates within the peripheral chamber. The central and peripheral chambers may be closed at the top by a wall that defines the bottom of the cavity receiving the mixture. The bottom of the peripheral chamber may be helical in shape around the axis of the cup and decrease in height as it progresses towards the outlet. The outlet may open forward of a connecting ramp between the bottom of the peripheral chamber and the upper wall of the mixer.This connecting ramp is preferably a portion of a helix extending the helix formed by the bottom wall of the peripheral chamber. Preferably, the peripheral chamber comprises the aforementioned annular partition and radial partitions that force the mixture to flow alternately between upper and lower regions of the peripheral chamber and between radially internal and external regions, the mixture flowing, for example, from an upper and radially external region to a lower and radially external region by passing through the aforementioned annular partition. The mixer may comprise an outer body into which is received a part forming the core of the mixer.The outer body radially closes the peripheral chamber to the outside and includes a support that separates the central and peripheral chambers. The outer body of the mixer and the mixer core can each be made in one piece by injection molding. Reduced dead volume. There is an advantage to reducing product losses during changes in the mixture formulation, as well as to allowing the color of the mixture to be varied as quickly as possible during application, particularly when the dispenser is coupled with an airbrush. According to one of its aspects, independently or in combination with the other aspects thereof, including the foregoing, the invention relates to a coloring product distribution system, comprising a dispenser receiving at least two cartridges, each having a reservoir containing a base product, the latter leaving the cartridge through an outlet channel in the cartridge.This outlet channel opens to the outside of the dispenser or near its external surface. 35 The outlet channel may, in particular, open into or near a mixing dispensing area, specifically less than 5 mm, preferably less than 3 mm, preferably less than 1 mm, preferably flush. 3052032 16 The cross-section of the outlet channel is, for example, between 1 and 3 mm². Thus, each base product from one cartridge can leave the dispenser without mixing with a base product from another cartridge, and 5 the dead volume that cannot be dispensed and which could increase the system's inertia is minimized. The product is more quickly available without having to circulate through specific channels in the dispenser housing, avoiding a tedious purging step when changing cartridges. The outside of the dispenser can be the product dispensing area,particularly when the dispenser is made with a non-removable cup into which the mixture is dispensed, or an area of ​​the dispenser intended for mounting a removable outlet interface, which defines the dispensing area. This outlet interface may include a cup as defined above. This mounting area corresponds, for example, to the end of the dispenser housing in the absence of the outlet interface. The mounting area may be substantially flat and perpendicular to the longitudinal axis of the dispenser housing. The dispenser may include three cartridges of base products. The dispenser may include compartments for receiving the cartridges,which are preferably received in a removable manner within the dispenser. The latter 20 may include passages for cartridge conduits defining the outlet channels. The length of these conduits is preferably such that they are located slightly recessed from the bottom or flush with the cavity used for dispensing the product, or alternatively, slightly recessed from or flush with the end face of the dispenser housing 25 defining the mounting area. These cartridge conduits may be end pieces used to drive the movement of pistons within the cartridges, as detailed above. Multiple outlet interfaces 30 There is a need to be able to easily produce, using the same dispensing system, color mixing products intended for the testing and selection phase, as well as larger quantities,intended for application to all or part of the hair. According to one of its aspects, independently or in combination with the other 35 aspects thereof, and in particular the foregoing, the invention relates to a dispensing system comprising an assembly having one and at least two output interfaces, each of which can be removably mounted on the dispenser. These output interfaces 3052032 17 allow the product(s) dispensed by the dispenser to be received, and are preferably chosen from the following: Remote assistance 5. It is possible to carry out the operations of preparing and then applying the mixing products in one location, read the results in the same location, and then transmit these results to a second location so that an analysis can be carried out, for example, by an expert. In doing so, the expert can analyze the results and, with expert conversion systems,to identify the best product to use. The expert can even suggest the best color (the one that is most aesthetically pleasing), and illustrate their choice with a simulation that they can share remotely with the user. The invention, according to one of its aspects, independently or in combination with its other aspects, including the foregoing, thus relates to a method for choosing 15 colors comprising the steps of: - enabling the establishment of a video link, for example via the internet, between a camera at a first site and a second site, - enabling the second site to directly or indirectly control a dispenser located at the first site, this dispenser allowing the color of a 20 distributed mixing product to be varied, - enabling a person present at the first site to apply the distributed mixing product and send a corresponding image to the second site.to receive feedback on the staining results. 25 Coupling of the distribution system to a spraying means The distribution system may include or be connected to a means for spraying the mixture, preferably an airbrush. The invention aims, according to another of its aspects, to further improve distribution systems comprising a spraying system, preferably an airbrush, and has as its object, according to one of its aspects, independently or in combination with the other aspects, and in particular the foregoing, an assembly comprising: - A spraying means, preferably an airbrush comprising a sampling chamber subjected to a driving airflow, - a dispenser comprising at least two compartments containing different base products,The products are delivered by spraying, preferably through separate dispensing orifices. 3052032 18 The dispenser may include three cartridges containing coloring products as defined above. The airbrush may include a stylus defining the dispensing chamber, the stylus being attached to the dispenser or to an output interface attached to the dispenser, or forming an integral part of this output interface. The dispensing system may include a control circuit for the operation of the dispenser, allowing the proportion of base products delivered into the dispensing chamber to be varied during the operation of the airbrush. The proportions may be modified according to the movement of the airbrush relative to the surface onto which the mixture is sprayed. This movement may be mechanized,where applicable. This control circuit may include or consist of a computer system as defined above. 15 The dispenser housing can serve as a handle when handling the assembly to dispense the mixture. The dispenser may include a camera and / or one or more sensors such as accelerometers to automatically locate the area to which the mixture is applied, and to automatically adjust the color according to the position, where applicable. The mixing can be carried out directly in the airbrush, with virtually no troublesome dead volume, thus allowing the sprayed mixture to be changed in real time. The vacuum created in the dispensing chamber is sufficient to draw in the base products,without hindering the dosing. The negative pressure in the sampling chamber is, for example, between 10 mbar and 200 mbar. The viscosity of the base products, measured at 1 atm and 25°C with a CONTRAVES TV rotary viscometer equipped with an MS-r3 or MS-r4 rotor at a frequency of 60 Hz, after 10 minutes of rotor rotation, is, for example, between 0.05 Pa·s and 50 Pa·s. The cross-section of the channels supplying the base products to the chamber is, for example, between 1 and 3 mm². The product supply is preferably continuous. 35 3052032 19 The invention will be better understood by reading the detailed description that follows, by non-limiting examples of its implementation, and by examining the attached drawing, in which: 5 Figure 1 is a schematic perspective view of an example of a distribution system according to the invention, - Figure 2 is a rear view of the distribution system of Figure 1,- Figure 3 illustrates the product dispensed by the distribution system, - Figure 4 is a schematic perspective view, with some 10 components removed, of the distribution system of Figure 1, - Figure 5 shows a basic product cartridge for the dispenser in isolation and in part, - Figure 6 shows the top of the cartridge with the drive piece, - Figure 7 shows the drive piece in isolation, in perspective, - Figure 8 shows a cartridge support in isolation, - Figure 9 shows the distributor's drive mechanism, - Figure 10 shows one of the motors in isolation, coupled to the rest of the drive mechanism, - Figure 11 shows an electronic motor control board, - Figure 12 is a cross-section of the distributor, - Figure 13 shows the distributor housing without the output interface.- Figure 14 shows a first example of an output interface in isolation, in top view, - Figures 15, 15A, 16, 16A, and 17 show other examples of output interfaces, - Figures 18 and 19 are two other views of the output interface of Figure 17, - Figure 20 shows the static mixer in isolation, - Figure 21 is an axial section of the output interface of Figure 17, - Figure 22 shows another output interface, designed to cooperate with an airbrush, - Figure 23 shows the different channels of the output interface of Figure 22 in transparency, - Figure 24 illustrates the output interface of Figures 22 and 23 connected to an airbrush, - Figures 25 to 29 show other examples of output interfaces, - Figure 30 illustrates the control of the distributor using from a portable terminal, - figure 31 represents an example of a graphical interface for controlling the dispenser,Figure 32 represents another example of a graphical interface; Figure 33 illustrates an example of the evolution of the graphical interface of Figure 32 during the use of the device; Figure 34 represents another example of a graphical interface; Figures 35 and 36 represent other examples of graphical interfaces; Figure 37 illustrates the evolution of the interface of Figure 36 during the use of the device; Figure 40 is a block diagram illustrating steps of an example of a method according to the invention; Figure 41 is a view analogous to Figure 40 of other examples of methods; Figure 45 represents an example of a support allowing the application of several different colored compositions; Figure 47 illustrates a system allowing the exchange of information with a remote advisor; and Figure 48 illustrates a support having a plurality of compartments containing different mixtures. The distribution system,According to the invention, shown in Figures 1 and 2, a dispenser 11 is provided in its upper part with an output interface 110 through which a custom-formulated cosmetic product is dispensed. The dispenser 11 can be operated with one hand. Its length, excluding the output interface, is, for example, between 140 and 160 mm and its diameter between 40 and 60 mm. The dispensing system 10 may include, as illustrated, an actuation means for controlling the dispensing, for example, a push button 12. When the user presses the push button 12, the dispenser 11 delivers the product based on information previously transmitted to it by a computer system, for example, via wireless transmission, as will be detailed later. The operation of the push button 12 can be programmed from an interface of the computer system.so as to continuously deliver the mixture as long as pressure is applied, or to deliver only a predefined dose, regardless of the duration for which the user presses the push button. As can be seen in particular in Figure 4, the dispenser 11 houses several cartridges 30, each containing a base product. The dispenser 11 allows the quantity of each base product to be dispensed so as to obtain, after mixing the dispensed doses, a product with the desired properties. Each of the cartridges 30 can be inserted into the housing of the dispenser 11 from the rear, as illustrated in Figure 2. In the example considered, the dispenser 11 receives three cartridges 30, but the invention also extends to the case where the number of cartridges 30 is different. In particular,Certain aspects of the invention also apply to the case of a single cartridge received in the dispenser housing. A cartridge 30 is shown in isolation in Figure 5. This cartridge comprises a body 31 in which a piston 5 32 can move along the longitudinal axis X of the cartridge so as to decrease the volume of a reservoir 33 located below the piston 32, containing the corresponding base product. The volume of the reservoir is preferably between 2 and 5 mL, for example, being on the order of 3 mL. The piston 32 is driven along the axis X by a hollow rod 34, externally threaded,engaging with a corresponding thread through the piston 10 32. The rod 34 defines a channel through which the product contained in the reservoir 33 can flow when the piston 32 moves in the body 31 in the direction of a decrease in the volume of the reservoir 33. The rod 34 is driven in rotation about the X-axis by a head 36 which can 15 rotate relative to the body 31, and communicates with a cannula 37. Each cartridge 30 is mounted in the dispenser 11 with a support piece 40, shown separately in Figure 8, which has an axially split clamping sleeve 41, on which a locking ring 43, visible in Figure 4, can slide. When a cartridge 30 is installed, the support piece 40 is engaged on it, on the side opposite the cannula 37,and the locking ring 43 moved on the sleeve 41 to clamp the support piece 40 onto the body 31. The support piece 40 secures the cartridge 30 in the dispenser housing 11. The head 36 of the cartridge 30, which has the cannula 37, is capped by a drive piece 50, shown separately in Figure 7, which clamps the head 36 so that it can rotate around the X-axis with it. When the drive piece 50 is rotated around the X-axis, its rotation is transmitted to the head 36, which can rotate relative to the body 31 and rotate the rod 34 with it. The friction force of the piston 30 on the inner surface of the body 31 is sufficient to prevent the piston 32 from rotating relative to the body 31.so that the relative rotation of the rod 34 and the piston 32 causes the latter to move along the X-axis. This movement is accompanied by a decrease in the volume of the reservoir 33 and an upward movement of the base product contained in the cartridge 30 through the rod 34, then into the cannula 37. The drive piece 50 has an internal channel 52 supplied by the cannula 37 and which opens to the outside through a distribution orifice 53. This channel 52 is formed by a nozzle 36. The drive piece 50 has a mounting skirt 54 which axially covers the head 36 of the cartridge 30. This mounting skirt 54 connects via a transverse wall 55 to the nozzle 56. The nozzle 56 has ridges 57 allowing its rotational coupling with a toothed wheel 60, visible in particular in the figure 9, belonging to a drive mechanism 5 for the distributor housing 11. In the example considered,The reliefs 57 are in the form of two diametrically opposed lugs, projecting on the tip 56 at its base, which engage in corresponding notches of the toothed wheel 60. The tip 56 has a narrowed part which has a groove receiving an O-ring 58. The narrowed part connects by a shoulder 59 to the rest of the tip. The head 36 of the cartridge 30 can carry an O-ring that ensures a leak-proof connection between the nozzle 37 and the drive piece 50. The drive mechanism comprises electric motors 70, equipped with reduction gears 71, visible in particular in Figure 10. The output shaft of these reduction gears is 15 coupled to a driving wheel 72 which meshes with the toothed wheel 60. In the example considered, the longitudinal X axes of each of the cartridges are arranged at 120° to each other, around the longitudinal Y axis of the distributor housing 11. The motors 70 are arranged between the cartridges 30,The rotation axes of the 20 motors are also arranged at 120° intervals around the Y-axis of the distributor 11. This results in a compact design for the distributor 11. The geared motors advantageously offer a torque exceeding 70 N·m. For example, a Maxon 118392 reference motor is used in conjunction with the Maxon 218418 planetary gearbox. Such a motor has a diameter of 10 mm, a power rating of 1.5 W, a nominal voltage of 3 V, an idle speed of 1300 rpm, and a maximum torque of 1.5 N·m. The reducer has a diameter of 10 mm, an absolute reduction ratio of 256 / 1, and a torque of 0.2 Nm. An electronic circuit 81, shown in isolation in Figure 11, is located near the upper end of the distributor housing 1. This electronic circuit 30 81 comprises a board 80 through which passages 83 pass for the output shafts of the reducers 71.as well as openings 82 for the narrowed portions 55 of the drive tips 56. Sleeves 82a can be fixed to the board 80 to prevent any product leakage to the board 80. The tips 56 pass through the sleeves 35 82a, preferably with minimal clearance. The board 80 carries the aforementioned push button 12 and supports a number of output pins 86 for powering the motors 70. The electronic circuit 81 includes a microcontroller or similar device for controlling the various motors 70, in order to dispense the desired quantity of each of the basic products. The dispensing resolution of the basic products is, for example, between 0.001 and 0.003 mL, being, for example, on the order of 0.0025 mL. 5. The distributor housing 11 also houses a battery whose accumulators 89 are advantageously located, as can be seen in Figure 4, each in line with a motor 70. Preferably,As illustrated in Figure 30, the dispenser 11 is controlled using a computer system 100 such as a portable terminal, for example 10 a smartphone, a tablet (e.g., an iPad), or a personal computer. The transmission of control information for the dispenser 11 by the terminal 100 is preferably wireless, for example, via a Bluetooth connection. In a specific example, the electronic board 81 manages the following points 15: - calculation of the volume of each product to be dispensed based on the volume fraction setpoint for each product, the operating mode (continuous, dose, or purge), and the flow rate or volume value; - measurement of the supply currents of the motors 70 and 20; - Bluetooth communication with the computer system 100; - management of the product dispensing button 12; - management of the on / off switch; - management of the LED display(s).- battery charge. 25 The board 80 includes, for example, the following components: - Texas Instruments CC2541 microcontroller, - blue SMD LED to provide status information to the user, - thermal fuse for protection, - 32 MHz crystal, 30 - on / off switch. The Texas Instruments CC2541 microcontroller integrates 256 KB of programmable flash memory RAM as well as numerous features. This microcontroller can be programmed in C, in the IAR Embedded Workbench environment. 35 The outlet ports 53 of the cartridges 30 open substantially at the upper end of the dispenser housing 11, as can be seen in particular in Figure 13. The upper face 14 of the dispenser housing 11 defines a surface 3052032 24 for mounting an output interface that channels the products from the cartridges to a picking or dispensing area. In the example in Figure 1,This output interface 110 is in the form of an added part, shown separately in Figure 14, which has openings 5 ​​on its periphery, as illustrated, for screws used to fix it to the housing of the dispenser 11. In this example, the output interface 110 defines a cup 115 into the bottom of which feed ports 116 open, each communicating via an internal channel in the output interface 110 with a respective outlet port 53. Thus, in the example considered, the base products contained in the cartridges 30 can be dispensed to the cup 115 without mixing. When using the dispenser 11, the user can fill the cup 115 with predefined proportions of each of the base products, as illustrated in Figure 3, and then dispense the product from the cup 115 for application. This 15th sample can be taken, for example, from a finger prick, as illustrated.or with any suitable cosmetic applicator. The cup 115 is preferably shallow, which facilitates cleaning, and of a diameter large enough not to obstruct access to the product. The depth p of the cup 115 is therefore preferably between 1 and 5 mm, and its diameter d, or that of the circumscribed circle when the crucible's outline is not circular, is preferably between 20 and 50 mm. Preferably, d / p ≤ 50. The feed orifices 116 are preferably less than 3 mm in diameter, for example, on the order of 1 mm. The outlet interface 110 can receive a closing cover 118 for the cup 115 to prevent the product from drying out or being exposed to soiling when not in use. This cover 118 is preferably made of transparent plastic and can be fixed by friction, screwing or snapping onto the upright of the cup 115,or more generally at any suitable location on the outlet interface 110. 30 The maximum capacity of the cup 115 is preferably between 0.02 and 0.25 ml. Preferably, the volume defined by the volume of the internal channels of the outlet interface 110 from the inlets of the feed ports 53 to the feed ports 116 is less than or equal to 0.4 m³. 35 The housing of the dispenser 11, in its configuration illustrated in Figure 13, i.e., without the outlet interface 110 described above, has the advantage of being able to be coupled to various forms of other outlet interfaces, depending on the makeup application desired and / or the area to be treated. Thus, Figure 15 shows a variant of the outlet interface 110 comprising a dispensing nozzle 150,oriented generally along a Z axis which 5 extends obliquely with respect to the longitudinal Y axis of the distributor 11. Three internal channels communicate respectively with the outlet ports 53 of the different cartridges 30 and open at the end of the nozzle 150. The outlet interface 110 can be mounted at one end of the housing of the distributor 11, as illustrated in Figure 15A. In the variant shown in Figure 16, the outlet interface 110 has three cannulas 10 160 which communicate respectively with the outlet ports 53. These cannulas 160 are grouped in the center of the outlet interface 110, which allows for the mounting on them, for example, of a tip 170 for applying the product to the eyelashes, as illustrated in Figure 25, a porous tip 180 for application to the lips, as illustrated in Figure 27, or a flocked tip 190 such as a felt tip, as illustrated in Figure 28. 15 In the case of the tip 170 in Figure 25,This nozzle, for example, as illustrated, has transverse grooves 171, between which product feed orifices open. The mixing of the different base products can take place inside the nozzle 170, thanks to an integrated static mixer, for example. The nozzle 180, for example, has an open-cell foam section 20 shaped like lips. The mixing of the base products can take place within an internal channel of the nozzle 180. The nozzle 190 can include a porous application element 191, at the end of a rod 192, connecting to a base 193 used for mounting on the rest of the outlet interface of Figure 16. Figure 16A schematically illustrates the possibility of having as an outlet interface 110 a cup 115 having passages 115a for outlet channels 30a of the cartridges,including when these conduits are used to drive the rotation of threaded rods that move the pistons. The length of the conduits 30a is such that they open into the bottom 115b of the cup or near its bottom, 30 without protruding into it. Preferably, the internal cross-section of the conduits 30a is small to minimize dead volume. In the example shown in Figures 22 to 24, the outlet interface 110 has a nozzle 200 which is generally oriented obliquely with respect to the longitudinal axis Y of the distributor 35. This nozzle 200 is traversed by internal channels 210, communicating respectively with the outlet orifices 53 of the base products from the cartridges 30. 3052032 26 The outlet interface 110 includes a mounting part 215 which allows the attachment of an airbrush 220 to the outlet interface 110,as illustrated in Figure 24. The nozzle 200 is attached in place of the airbrush's usual reservoir, and the channels 210 open into the airbrush nozzle where they are subjected to the vacuum 5 created by the velocity of the driving airflow. A clamp is formed by two uprights 216 to receive the body of the airbrush stylus 220 and secure it by snapping. Preferably, the orientation of the nozzle 200 is such that it allows the spray axis to be oriented substantially perpendicular to the longitudinal axis of the distributor housing 10. The distributor housing 11 can then be used as a handle to manipulate the airbrush. The outlet orifices 210 are advantageously very close together, being separated by thin internal partitions in the nozzle 200. Preferably,The cross-section of each outlet orifice is less than or equal to 15 to 3 mm² over a length of at least 5 mm. The upper part of the dispenser housing 11 can be fitted with a support movable relative to the housing, for example in the form of a turret 250, as illustrated in Figure 29. This turret 250 rotates, for example, around an axis of rotation 20 which coincides with the longitudinal axis Y of the dispenser. The turret 250 can have several compartments 255, each capable of holding the products dispensed by the dispenser 11 in a corresponding filling position. To successively fill the different compartments, the turret 250 is rotated, for example, by a quarter turn each time. The presence of several compartments 255 allows for the dispensing of products with different formulations, from the different base products.for example, to vary the color of the products present in the different compartments 255. The dispenser 11 can be used to deliver a mixture whose formulation changes over time and collect the mixture in a container 30 that is movable relative to the dispenser, so that the mixture is deposited in a location within the container that varies over time, in order to create a gradient. For example, as illustrated in Figures 29A and 29B, the dispensing system includes an outlet interface 110 having a fixed part relative to the dispenser and a movable part 252 having a compartment 253 to receive the mixture 35. For example, the dispenser 11 is arranged in this case with the cartridge outlets facing downwards, and equipped with a mixer, so that the mixture 3052032 27 falls under its own weight into the compartment 253. A motor can move the movable part of the outlet interface relative to the dispenser,synchronized with the variation in the characteristics of the mixture, so that a gradient is obtained along the housing 253, as illustrated in Figure 29B. 5 The distribution system may include a base 254 that holds the distributor upside down. The outlet interface 110, particularly when it includes a cup, may include a static mixer that ensures the mixing of the base products. Figures 17 to 21 show an outlet interface 110 including such a static mixer. This outlet interface 110 may include an outer body 260 that is fixed to the housing of the distributor 11 and that has an outer tubular support 270. The body 260 has channels 261 for the intake of the different base products. These channels 261 open into a central chamber 262, delimited by an internal tubular upright 263. This upright 263 is traversed by an opening 264 which opens into an annular space 265,between the inner upright 263 and the outer upright 270. A static mixer core 280, shown in isolation in Figure 20, is disposed in this space 265. The central chamber 262 can communicate with a peripheral chamber comprising a series of partitions formed by the mixer core, which act as deflectors for the mixing and create shear forces. The peripheral chamber may include a perforated annular partition 284 defining openings 285, one of which is visible in Figure 21.through which the mixture 25 passes as it circulates in the peripheral chamber. The central and peripheral chambers can be closed at the top by a wall 286 that defines the bottom of the cavity receiving the mixture. The bottom 287 of the peripheral chamber can be helical in shape and decrease in height as one progresses towards the outlet. The latter 30 can open forward of a connecting ramp 288 between the bottom 287 of the peripheral chamber and the upper wall 286 of the mixer, this connecting ramp preferably being a portion of a helix extending the helix formed by the bottom wall of the peripheral chamber. Preferably, the peripheral chamber comprises the aforementioned annular partition and radial partitions 281 that force the mixture to circulate alternately between upper and lower regions of the peripheral chamber and between radially inner and outer regions.The mixture flows, for example, from an upper and radially external region 3052032 28 to a lower and radially external region by passing through the aforementioned annular partition. The body 260 radially closes the peripheral chamber to the outside. The outer body 260 of the mixer and the core 280 of the mixer can each be made in one piece by injection molding. The product reaches the core 280 of the static mixer through the passage 264, then flows between the uprights 263 and 270 over virtually a complete circumference, up to the outlet 282. The numerous baffles imposed by the partitions 281 cause an intimate mixing of the components introduced into the outlet interface 110. The resulting mixture can be drawn off by the user from the compartment 283, above the static mixer. As previously stated,The dispensing system 10 according to the invention preferably includes a human-machine interface that allows the user to easily and intuitively control the dispenser 11. This interface may belong to a computer system 100 that communicates with the dispenser 11. Figures 31 to 37 show various examples of touch interfaces that allow the user to choose the color of the mixture resulting from the metered dispensing of the different base products. This interface may have, as illustrated in Figure 31, a color selection area, for example in the form of a triangle whose vertices correspond to the colors of each of the base products contained in the cartridges. The user can move a cursor 300, for example in the form of a ball, 25 relative to the vertices A, B, and C of the triangle. The closer the cursor 300 is moved to one of the vertices,The larger the fraction of the corresponding base product relative to the total quantity of the various products distributed, the greater the fraction. The fraction of each product relative to the total quantity can be indicated by a numerical value on the interface. The interface can allow the user to increase or decrease the quantity of each product, for example by using control buttons.which allow precise adjustment of the quantity of each of the basic products. The surface of triangle 310 can have a color that varies locally so that 35 is representative at each point of the color of the mixture resulting from the weighting of the different basic products in proportions corresponding to the relative coordinates at that point. 3052032 29 The interface may include a button 305 allowing access to a specific menu for adjusting the volume of product dispensed to purge the dispenser. The interface may also advantageously allow adjustment of the product flow rate using buttons 304 and 306, which link to a specific flow rate adjustment menu. 5 In the example considered, the interface offers a choice between a continuous dispensing mode, using button 304,where the products are dispensed as long as the user presses the control button 12. The corresponding dose can be transmitted to the interface and displayed. Button 306 allows the user to select a dose mode, in which even a brief press of button 12 triggers the dispensing of a predefined dose. To vary the flow rate, the dispenser adjusts, for example, the duty cycle of the motors. The interface can be configured to allow the user to program or save their preferred settings via a favorites menu 307. The touchscreen interface shown in Figure 32 displays three colored zones 400 on the screen, each corresponding to the color of one of the basic products contained in the dispenser 10.and a central zone 410 displaying the color of the resulting mixture. 20 The relative quantity of each of the base products can be adjusted using sliders 415 that move, for example, along lines joining each of the zones 400 to the central zone 410. During use of the interface, it can memorize a given setting and display a button 420 on the screen in the color of the mixture. The user can then, 25, simply press this button 420 to dispense a mixture of the corresponding color. In the example in Figure 34, the interface displays a given shade in a zone 500 and allows the user, using control buttons 510 each in the color of the corresponding base product, to increase or decrease the proportion of this 30 base product in the final mixture. The color of zone 500 is recalculated based on actions on control buttons 510. In the variant shown in Figure 35,The interface displays a color chart with several zones, each corresponding to a specific proportion of the different basic products. The user can select one of these zones, for example, by tapping it with their finger. Examples: A dispenser such as the one illustrated in Figure 3 is created. The dispenser is configured to communicate with a tablet such as an iPad. This computer system runs an application called "pMix" developed in Apple's specific environment (Xcode 4 and iOS Simulator) using the Objective-C language. It uses the Foundation, UlKit, and CoreGraphics frameworks, providing tools for manipulating data structures.calculation tools and features related to the graphical user interface. The application also uses the CoreBluetooth framework, providing access to Bluetooth 4 Low Energy devices with the following main tasks: - Searching for Bluetooth 4.0 Low Energy devices, - Connecting / disconnecting and managing connection parameters, - Read and / or write communication based on the GATT (Generic Attribute Profile) architecture. The application offers the following features: - Defining fractions of basic products, - Choosing the operating mode when pressing the control button (continuous, purge, or dose), - Displaying a volume fraction triangle as illustrated in Figure 30, with volume fraction management via touch on the triangle or using the + / - buttons associated with each product, - Bluetooth connection / disconnection and real-time transfer of instructions to the dispenser.- Flow rate settings in continuous mode, and quantity settings in dose mode, 25 - Calculation, display, and transfer to the dispenser of the volume fractions of the products in real time, according to the setpoint, with the sum of the fractions always equal to 100%, - Retrieval and display of the torques of the three motors in real time, and - Saving of the main parameters in a configuration file. 30 Continuous mode is a dispensing mode where the mixture of the three base products is dispensed as long as the user presses the dispensing button 12. The product is delivered at a flow rate, an estimate of which is displayed above the "Continuous" button 304. The flow rate is selected in a "Settings" menu. "Dose" mode is a dispensing mode of the mixture by dose,where dose 35 is delivered following a user press of the dispensing button 12. One press is sufficient, and the user can then release the button. The total dose of product 3052032 31 dispensed is that indicated above the "Dose" button 306, for example, 0.1 ml. This volume can be changed in the "Settings" menu. The "purge" mode is a dispensing mode where a dose of equal volume fraction mixture (33%) is delivered as soon as the user presses the dispensing button 12, as in the "Dose" mode. One press is sufficient, and the user can then release the button. When the dose has been fully dispensed, the button can be released. If released before completion, dispensing stops, even if the specified volume is not reached. The total dose of product dispensed is that indicated above a "Purge" button 305.3 ml, for example. This volume can be changed in the Settings menu. The user determines the desired color using the application running on the tablet, which calculates the fractions of the different products. The tablet communicates this value to the dispenser via Bluetooth. The electronics integrated into the dispenser retrieve the information and automatically adjust the flow rates of the three cartridges to obtain a mixture of the desired color. When the user wants to use the product, they press the dispenser button. They can press and hold the button for as long as they want in "continuous" mode. In "dose" mode, the user presses the button once, and the predefined dose is dispensed. Dispensing can be continuous, meaning the motors operate continuously, dispensing the entire volume at once, or iterative, with the motors operating intermittently; in this case,The time interval between two pulses allows the flow rate to be varied. Small volumes are delivered one after the other, while others are delivered in several stages. The pulses can be separated, for example, by intervals of 50 ms, 100 ms, or 200 ms. The duration of a pulse during which the motor runs can range from 50 to 150 ms. The main page of the "pMix" application in this example contains the following 30 elements, as shown in Figure 31: - Status bar at the top of the screen: indicates the status of the Bluetooth connection, or pMix if there is no Bluetooth connection; - Tab bar at the bottom of the screen: allows you to select the active page: Main page, Settings, Bluetooth,Products and Favorites; 35 - Continuous button 304 to select the continuous product dispensing mode; - Purge button 305 to select the Purge mode; 3052032 32 - Dose button 306 to select the dose dispensing mode with the dose volume associated with the Dose button; - Blue ball 300 that the user can move within the volumetric triangle by dragging it or double-tapping it; 5 - "-" buttons 302 for each product A, B, and C: decreases the fraction of the selected product by moving along the line connecting the point to the top of the selected product; - "+" buttons 302 for each product A,B and C: increases the fraction of the selected product by moving along the line connecting the point to the apex of the selected product; - Volume fraction as a percentage of each product: modifiable by the user and updated in real time according to the input of the + and - buttons and the position of the ball. When the volume fractions are modified by moving the ball or using the + and - buttons, the volume fraction values ​​of products A, B, and C are updated automatically. When the volume fractions are modified with the + and - buttons, the ball is automatically moved to the corresponding position on the triangle. When the application running on the tablet starts, it automatically connects to the dispenser if it is detected. When the dispenser is turned off or the Bluetooth connection is lost,The tablet disconnects. When the user adjusts the proportions of products A and B, the values ​​are transmitted in real time to dispenser 11. The application's Settings page includes the following elements: 25 - Status bar at the top of the screen: indicates the Bluetooth connection status or pMix if there is no Bluetooth connection; - Tab bar at the bottom of the screen: allows the user to select the active page: main page, Settings, Bluetooth, or Info; - "Volumes" section with a text field for the user to define the dose volume in ml (e.g., 2 ml) and a field for the purge volume in ml (e.g., 3 ml). In this example, the minimum doses are 0.023 ml and the maximum doses are 9.90 ml (3 x 3.3 ml); - "Flow Rate" section with flow rate selection: fast (≥ 0.03 ml / s), medium (≥ 0.02 ml / s) or slow (≥ 0.01 ml / s); 35 - "Dose" section with the choice of iterative mixing,to distribute a mixture of products with small volumes delivered one after the other in several stages; otherwise, the total volume of each product is dispensed all at once; 3052032 33 - "Triangle Image" section to choose the triangle image that will be displayed on the main page in order to display a triangle with the colors dispensed by dispenser 11. Using a "Choose Image" button on the "Settings" page, an album is accessed. 5 The "Products" page of the application contains the following elements in the example considered: - Choice of the value of each product in coder step units, from 0 to 1414. Each unit corresponds to a dispensed volume of 2.33 pl, which is the smallest quantity that the dispenser in this example can dispense; when this sheet is 10 displayed, the product values ​​on this sheet are transmitted in real time to the dispenser. As soon as the sheet is no longer displayed,The values ​​sent to the dispenser are those from the main sheet with the triangle; - Real-time display of motor pairs A, B, and C, refreshed every 45 values. 15 The product delivery mode is direct or iterative dose, depending on the option chosen in the Settings sheet. The "Favorites" page allows configurations to be saved as files. In the example considered, it provides access to 10 files, namely "Configuration 1" to "Configuration 0," in addition to the default file. These files save, for example, the following 20 parameters: - fractions of products A, B, and C - Purge volume - Dose volume - fast, medium, or slow flow rate - Dose, Purge, or Continuous mode - continuous or iterative dispensing. Example 1 30 Several coloring products are made from the following commercial products: A1: Majirel 8 coloring product,30 + 20V hydrogen peroxide-based oxidant (1:1 mixture). B1: Majirouge Mix 6.64 colorant + 20V hydrogen peroxide-based oxidant (1:1 mixture). 35 C1: Majirel 4.15 colorant + 20V hydrogen peroxide-based oxidant (1:1 mixture). 3052032 34 These three mixtures are placed in cartridges, and the cartridges are placed in the dispensing system. The system then produces 13 mixtures: 50 / 50 / 0, 50 / 0 / 50, 0 / 50 / 50, 50 / 25 / 25, 25 / 50 / 25, 25 / 25 / 50, 33 / 33 / 34, 66 / 34 / 0, 66 / 0 / 34, 34 / 66 / 0, 34 / 0 / 66, 0 / 34 / 66, 0 / 66 / 34. Test 1: On brown hair (Level 4). Each mixture is applied in 100 mg doses to small sections (1 cm²) of "brown" hair. Each section is spaced 1 cm apart. After 30 minutes, the hair is rinsed and then dried. A photograph is then taken of the entire area, and the image is enlarged on the screen. Then, we choose the color corresponding to the 10th 50 / 25 / 25 mixture as being the most satisfactory.This choice takes into account the hair being treated. Then, the corresponding mixture is prepared (by hand) in sufficient quantity for application to the entire head of hair. Test 2: On brown hair (Tone Level 6.5). 15 On this hair, we want to achieve a color close to the result of test 1. We don't know beforehand which product or mixture to use. We then prepare, according to the preparation method described in test 1, mixtures which are applied in 100 mg doses to small 1 cm² sections of hair. After 30 minutes, the hair is rinsed and then dried. A 20-inch photo is then taken of the entire area and the image is enlarged on the screen. Then, we choose the color that appears closest to the 50 / 25 / 25 mixture obtained in test 1. In doing so, we select the 33 / 33 / 34 mixture. Then,The mixture is prepared (by hand) corresponding to 33 / 33 / 34 and applied to the entire head of brown hair. The result is then very similar, starting from a different head of hair. Example 2: Two coloring products are prepared from the following commercial products: A1: Majiblond coloring product (1 / 2 tube, i.e., 25 ml) + 20V hydrogen peroxide-based oxidant (25 ml) + 25 g of water. B1: Majiblond (1 / 2 tube, i.e., 25 ml) + 40V hydrogen peroxide-based oxidant (25 ml) + 1 sachet of lightening concentrate (25 g). These two mixtures are placed in cartridges, and the cartridges are placed in the mixing product preparation system. The system then produces 13 mixture products: 100 / 0, 90 / 10, 80 / 20, 70 / 30, 60 / 40, 0 / 50, 40 / 60, 30 / 70, 20 / 80, 10 / 90, and 0 / 100. Each mixture product is applied in 100 mg doses to small areas of hair (1 cm²) spaced 1 cm apart. After 30 minutes,The hair is rinsed and then dried. A photo is then taken of the resulting color combination and enlarged on the screen. This photo is then sent to a hairdresser located remotely. The hairdresser chooses the color (60 / 40) that appears to be the most satisfactory and proposes it remotely. After acceptance, the hairdresser prepares the chosen developer. They also prepare a 10g sachet of concentrate. Then, they send a kit containing a tube of Majiblond, the chosen developer formula, and the sachet. They also send instructions to follow (mix 1 / 2 tube of Majiblond, the developer formula, and the sachet). 15,

Claims

CLAIMS 1. System (10) for dispensing a hair treatment product comprising a dispenser receiving at least two cartridges (30) each having a reservoir and containing first and second coloring and / or perming and / or straightening products, the dispenser allowing the mixing products to be delivered in adjustable proportions, optionally a device for dispensing the mixing product(s) and a device for applying the mixing products.

2. System according to claim 1 in which the distribution system allows for the distribution of coloring products.

3. System according to claim 1 or 2, the first and second colouring products are selected from colouring compositions comprising at least one direct dye and / or an oxidation dye, an oxidizing agent, an alkali agent, an acidic agent, a neutralizing agent or an uncoloured / non-colouring product to permit dilution of compositions containing dyes and / or oxidizing agents.

4. System according to any one of the preceding claims, comprising a third cartridge (30) with a third coloring product.

5. System according to any one of the preceding claims, the cartridges being received in a removable manner in the dispenser.

6. System according to any one of the claims, each product leaving the cartridge through an outlet channel of the cartridge, the outlet channel being defined by a dispensing nozzle (56) of the cartridge driven in relative rotation with respect to a body of the cartridge by a drive mechanism of the distributor to dispense the coloring product contained in the cartridge.

7. A hair coloring process comprising supplying a coloring mixture from at least two coloring products, the mixture being obtained from the system defined according to claims 1 to 6. Applying these mixtures to an inconspicuous part of the hair, choosing the desired color, and selecting a coloring product corresponding to the desired color.

8. A method according to claim 7 comprising an additional step of preparing a coloring product in such quantity that it can be applied to the whole of the hair from the choice of coloring product corresponding to the desired color.

9. A method according to claim 7 wherein the colouring mixture(s) are prepared in a quantity of less than 1 g and applied for testing purposes, preferably on an inconspicuous part of the hair or a part cut before the application of the colouring mixture selected at the time of the test and applied to the whole of the hair.

10. A method according to claim 9 wherein, after testing and selecting the colouring mixture, the selected colouring mixture is prepared in sufficient quantity to fully colour the hair.