Hair dyeing method and hair products

Abstract

To dye hair to the desired finish color easily and consistently, regardless of the practitioner's sense or experience.SOLUTION: The hair dyeing method disclosed herein is a method for dyeing a subject's hair to a desired finish color. In this hair dyeing method, hair is dyed using a combination of three hues: a target color that approximates the finish color and contains a tint of the finish color; a complementary color that offsets the subject's hair color before dyeing; and a correction color that adjusts for differences in the pigment in the subject's hair before dyeing. The complementary color may be any one of cyan, violet, and magenta.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hair dyeing method for dyeing a subject's hair to a desired finish color, and also to hair products used in the hair dyeing method. [Background technology]

[0002] Conventionally, when hair is dyed (hair colored) at a beauty salon or barber shop (hair salon), the salon staff presents multiple colors to the customer using a catalog such as a magazine, and allows the customer to select the desired finish color from among them.

[0003] On the other hand, it is known that the hue of hair after dyeing is affected by the base hue (base color) of the subject's hair. Therefore, hair dyeing methods have been developed to achieve a consistent finish color that the subject desires, regardless of the base color.

[0004] For example, Patent Document 1 discloses a hair dyeing method in which, when dyeing hair, the hair is first dyed with a base color, and then a finishing color is dyed on top of the base color, thereby achieving a selected color that is consistent regardless of the hair color. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-304637 Summary of the Invention [Problem to be solved by the invention]

[0006] The color of hair after dyeing is often influenced by the base color of the subject's hair. Therefore, to reduce this influence, hair dyeing agents tend to have high penetration and color development. However, if the base color before dyeing is strongly influenced, the desired hair color may not be achieved after dyeing.

[0007] On the other hand, the technology described in Patent Document 1 seems to avoid the effect of differences in hair color on the finished color by first dyeing the hair with a base color and then dyeing the finish color over the base color. However, this technology requires dyeing the hair twice, once with the base color and once with the finish color, which places a heavy burden on the hair dyer and the subject. Furthermore, with the technology described in Patent Document 1, the base color is selected based on the subject's skin color, so depending on the subject's base color, the desired hair color may not be achieved after dyeing. Furthermore, the actual color tone after dyeing is largely dependent on the practitioner's sense and experience, and there is still room for improvement in technology for easily and reliably dyeing hair to the subject's desired finish color.

[0008] The object of the present disclosure is to provide a technology that enables a subject to dye their hair to the desired finished color simply and stably, regardless of the practitioner's sense or experience. [Means for solving the problem]

[0009] The hair dyeing method disclosed herein is a hair dyeing method for dyeing a subject's hair to a desired finish color, characterized in that the hair is dyed using a combination of three hues: a target color that is a hue that approximates the finish color and contains the hue of the finish color; a complementary color that is a hue that cancels out the subject's hair color before dyeing; and a correction color that is a hue that adjusts for differences in pigment in the subject's hair before dyeing.

[0010] In the above-mentioned hair dyeing method, the hair coloring agent to be used for hair dyeing (hair coloring) is selected through three steps: a step of selecting a target color, a step of selecting a complementary color, and a step of selecting a correction color, thereby enabling the subject to easily and stably dye their hair to the desired finished color.

[0011] In the above-described hair dyeing method, the complementary color may be a hue for canceling out the saturation of the subject's hair color before dyeing, and may be any one of three colors: cyan, violet, and magenta. In this case, the complementary color may be selected based on the lightness of the subject's hair color before dyeing, such that cyan is selected when the lightness is a predetermined low level, violet is selected when the lightness is a predetermined medium level, and magenta is selected when the lightness is a predetermined high level. This allows the subject to achieve the desired finish by canceling out the saturation of the subject's hair color before dyeing (base color), i.e., by making the base color achromatic.

[0012] In the above hair dyeing method, the correction color may be a brownish color. In this case, the amount of the correction color is selected based on the color unevenness intensity, which is defined as the difference in lightness between adjacent hair strands in the subject's hair before dyeing, and the amount of the correction color can be selected so that the higher the color unevenness intensity, the greater the amount of the correction color. This can correct the color unevenness, which is the difference in lightness between adjacent hair strands, and develop the target color according to the subject's desired finish.

[0013] The present disclosure can also be understood as a hair product used in the above-described hair dyeing method. That is, the hair product of the present disclosure is a kit including an agent for dyeing hair to the hue of the target color, an agent for dyeing hair to the hue of the complementary color, and an agent for dyeing hair to the hue of the correction color. Alternatively, the hair product of the present disclosure is a kit including agents for dyeing hair to the hue of the complementary colors, i.e., cyan, violet, and magenta. [Effects of the Invention]

[0014] According to the present disclosure, a subject's hair can be dyed to the desired finished color simply and stably, regardless of the practitioner's sense or experience. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a flowchart showing the flow of selecting agents in the hair dyeing method of the present disclosure. [Figure 2] FIG. 10 is a diagram illustrating examples of the hues and amounts of complementary colors selected based on the lightness of a base color. [Figure 3] 10A and 10B are diagrams illustrating examples of amounts of correction colors selected based on the intensity of color unevenness of a base color. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a hair dyeing method for dyeing a subject's hair to a desired finish color, which is an embodiment of the present disclosure, will be described with reference to the drawings relating to the hair dyeing method of the present disclosure. The configurations of the following embodiments are examples, and the present disclosure is not limited to the configurations of the embodiments.

[0017] A hair dyeing method according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a flowchart showing the flow of agent selection in the hair dyeing method of the present disclosure.

[0018] In this flow, first, in S101, a step of selecting a target color is executed. Here, the target color is a hue that approximates the subject's desired finish hair color and includes the hue of the finish color. In step S101, through communication between the subject who desires hair dyeing (hair coloring) and the staff of the beauty salon or barber shop (hair salon) that will be performing the hair coloring treatment on the subject, the staff of the hair salon understands the subject's desired finish hair color and selects a target color to achieve the desired finish color.

[0019] In addition, when communicating with the subject, the staff can use a color chart of dyed white hair to understand the subject's desired finished hair color.

[0020] In the target color selection step, the target color may be selected from hair color agents such as gray, beige, brown, blue, pink, purple, green, orange, dark, light, and clear, taking into account the base color of the subject's hair and the complementary color described below, so that the target color is the same hue as the finished color of the subject's desired hair, or the target color may be adjusted by mixing the colors.

[0021] Next, in S102, a step of selecting a complementary color, which is a hue for canceling out the subject's hair color before dyeing, is performed.

[0022] It is known that even when the same hair coloring agent is used, the resulting hue varies greatly depending on the subject's pre-dyeing hair color (base color). Conventional hair coloring agents have been selected based on the practitioner's intuition and experience, without any theoretical basis for determining how the resulting color changes depending on the subject's base color. In other words, a technique for easily and reliably dyeing hair to the desired finish color has been unknown until now.

[0023] Therefore, after extensive research, the present inventor has newly discovered that by combining a complementary color with the above-mentioned target color, it is possible to neutralize the saturation of the subject's hair color before dyeing (base color), i.e., to make the base color achromatic, while still allowing the target color to be developed in the desired finish of the subject.

[0024] In hair coloring, the melanin in the base color of the subject's hair is destroyed by the bleaching action of the hair coloring agent, and the hue of the hair coloring agent is imparted to the subject's hair. The brightness of the hair color changes depending on the state of the melanin in the hair. In other words, although the hue of the complementary color can cancel out the saturation of the base color, the brightness of the base color may result in differences in the finished color after dyeing.

[0025] Therefore, in the hair dyeing method of this embodiment, the complementary color is selected based on the brightness of the subject's hair color (base color) before dyeing. Specifically, the complementary color is composed of one of three colors: cyan, violet, and magenta. When the brightness of the base color is a predetermined low level, cyan is selected. When the brightness of the base color is a predetermined medium level, violet is selected. When the brightness of the base color is a predetermined high level, magenta is selected. This will be explained in detail with reference to FIG. 2.

[0026] Figure 2 shows an example of the hue and amount of a complementary color selected based on the lightness of the base color. The lightness level is a well-known index that describes the lightness of hair on a 15-point scale, with the higher the value, the higher the lightness. The amount of the complementary color shown in Figure 2 is a ratio to the amount of the target color.

[0027] As shown in FIG. 2, when the base color lightness level is a predetermined low level (5 to 13 levels), cyan is selected as the complementary color, and its amount is 10%. When the base color lightness level is a predetermined medium level (14 to 16 levels), violet is selected as the complementary color, and its amount is 10%. When the base color lightness level is a predetermined high level (17 to 19 levels), magenta is selected as the complementary color. When the base color lightness level is 17 levels, its amount is 10%, when the base color lightness level is 18 levels, its amount is 5%, and when the base color lightness level is 19 levels, its amount is 3%.

[0028] The amounts of complementary colors mentioned above are merely examples, and the amount of cyan may be 5 to 30% when the lightness of the base color is a predetermined low level, and the amount of violet may be 5 to 30% when the lightness of the base color is a predetermined medium level.

[0029] By selecting complementary colors in this manner, the saturation of the subject's hair color before dyeing (base color) can be neutralized, i.e., the base color can be made achromatic, while the target color can be developed according to the subject's desired finish.Therefore, the subject's hair can be dyed to the desired finished color simply and stably, regardless of the practitioner's sense or experience.

[0030] The complementary colors may be automatically selected by a predetermined information processing device. The information processing device may be any electronic device capable of performing arithmetic and processing operations, such as acquiring, generating, and updating data, including personal computers, servers, mainframes, tablet devices, and other electronic devices. That is, the information processing device may be configured as a computer having a processor such as a CPU or GPU, a main storage device such as RAM or ROM, and an auxiliary storage device such as an EPROM, a hard disk drive, a solid-state drive, or removable media. The removable media may be, for example, a USB memory or a disc recording medium such as a CD or DVD. The auxiliary storage device stores an operating system (OS), various programs, various tables, and the like.

[0031] Furthermore, the information processing device may be provided with software, hardware, an OS, etc., dedicated to the hair dyeing method according to this embodiment, or may not be provided with these and may instead use SaaS (Software as a Service), Paas (Platform as a Service), or IaaS (Infrastructure as a Service) using a cloud server as appropriate.

[0032] The information processing device has a communication unit, a storage unit, and a control unit as functional units, and can realize functions that match the predetermined purpose of each functional unit by loading a program stored in the auxiliary storage device into the working area of ​​the main storage device and executing the program, which controls each functional unit, etc. However, some or all of the functions may be realized by hardware circuits such as ASICs and FPGAs.

[0033] Here, the communication unit is a communication interface for connecting the information processing device to a network. The communication unit includes, for example, a network interface board and a wireless communication circuit for wireless communication. The information processing device is connected to a user terminal or other external device via the communication unit so as to be able to communicate with the user terminal and other external devices.

[0034] The storage unit includes a main storage unit and an auxiliary storage unit. The main storage unit is a memory in which the programs executed by the control unit and the data used by the control programs are expanded. The auxiliary storage unit is a device in which the programs executed by the control unit and the data used by the control programs are stored. The storage unit stores the relationship between the lightness of the base color and the hue and amount of the complementary color, as described above, and the relationship between the color unevenness intensity of the base color and the amount of the correction color, as described below.

[0035] The control unit is a functional unit that manages the control performed by the information processing device. The control unit can be realized by an arithmetic processing unit such as a CPU. The control unit further includes an acquisition unit and a selection unit as functional units. These functional units may be realized by the CPU executing a stored program.

[0036] Here, the acquisition unit acquires the brightness of the subject's hair color (base color) before dyeing. The practitioner can use a user terminal to send an image or the like containing the subject's base color to the information processing device. The information processing device then determines the brightness of the sent base color and acquires the brightness of the subject's base color.

[0037] Here, the user terminal in this embodiment has a communication unit, an input / output unit, and a storage unit as functional units. The communication unit is a communication interface for connecting the user terminal to a network, and is configured to include, for example, a network interface board and a wireless communication circuit for wireless communication. The input / output unit is a functional unit for displaying information transmitted from the outside via the communication unit, and for inputting information when transmitting the information to the outside via the communication unit. The storage unit is configured to include a main memory device and an auxiliary memory device, similar to the storage unit of an information processing device.

[0038] The input / output unit further includes a display unit, an operation input unit, and an image / audio input / output unit. The display unit has a function of displaying various information and is realized, for example, by an LCD (Liquid Crystal Display), an LED (Light Emitting Diode) display, an OLED (Organic Light Emitting Diode) display, etc. The operation input unit has a function of accepting operation input from a user and is realized, specifically, by soft keys or hard keys such as a touch panel. The image / audio input / output unit has a function of accepting input of images such as still images and videos and is realized, specifically, by a camera using an image sensor such as a Charged-Coupled Device (CCD), a Metal-Oxide-Semiconductor (MOS), or a Complementary Metal-Oxide-Semiconductor (CMOS). The image / audio input / output unit has a function of accepting input and output of audio and is realized, specifically, by a microphone or speaker.

[0039] Using the user terminal configured in this manner, the practitioner can transmit an image containing the subject's base color to the information processing device. Here, the information processing device may provide the user terminal with an interface for inputting such information.

[0040] The determination unit of the information processing device can then select the hue and amount of the complementary color to be combined with the target color using the relationship between the lightness and the hue and amount of the complementary color based on the lightness of the subject's hair color (base color) before dyeing obtained as described above.

[0041] Note that such a determination process may be performed by a user terminal without going through the information processing device described above.

[0042] Returning to FIG. 1, next, in S103, a step of selecting a correction color, which is a hue for adjusting for differences in pigments in the subject's hair before dyeing, is executed.

[0043] Here, if there is unevenness in the brightness of adjacent hair strands in a subject's hair before dyeing, this can result in uneven hue in the finished hair after hair coloring. To prevent this, it is conceivable to bleach the subject's hair before dyeing, thereby changing the subject's hair into a state in which the yellowish color of pheomelanin is expressed. However, even in this case, it has been found that bleaching alone cannot completely suppress the uneven hue. Therefore, the present inventors have conducted extensive research and have newly discovered that by combining a correction color composed of a brownish color close to the hue of eumelanin with the above-mentioned target color and complementary color, it is possible to correct the uneven color, which is the uneven brightness of adjacent hair strands.

[0044] Specifically, in the hair dyeing method of this embodiment, the amount of correction color is selected based on the color unevenness intensity, which is defined as the difference in brightness between adjacent hair strands in the subject's hair before dyeing. At this time, the amount of correction color is selected so that the higher the color unevenness intensity, the greater the amount of correction color. This will be explained in detail with reference to FIG. 3.

[0045] Figure 3 is a diagram illustrating the amount of correction color selected based on the intensity of color unevenness of the base color. Note that the weak, medium, and strong intensity of color unevenness is represented by the level of the difference in brightness between adjacent hair strands, with the intensity of color unevenness being weak when the brightness difference is between Level 1 and Level 2, medium when it is between Level 3 and Level 4, and strong when it is Level 5 or higher. The amount of correction color illustrated in Figure 3 is a ratio to the amount of the target color.

[0046] As shown in Figure 3, when the intensity of color unevenness of the base color is weak, the amount of correction color is 10%, when the intensity of color unevenness of the base color is medium, the amount of correction color is 20%, and when the intensity of color unevenness of the base color is strong, the amount of correction color is 30% or more.

[0047] The above correction color amounts are merely examples, and the amount may be 10% or more and less than 20% when the base color has a weak color unevenness intensity. Furthermore, the amount may be 20% or more and less than 30% when the base color has a medium color unevenness intensity. Furthermore, the amount may be 30% to 50% when the base color has a strong color unevenness intensity.

[0048] By selecting a correction color in this way, color unevenness, which is the difference in brightness between adjacent hair strands, can be corrected and the target color can be developed according to the finish desired by the subject, thereby making it possible to dye the subject's hair to the desired finish color simply and stably, regardless of the practitioner's sense or experience.

[0049] The correction color may be automatically selected by a predetermined information processing device, similar to the selection of the complementary color. In this case, the information processing device acquires the color unevenness intensity of the subject's hair color (base color) before dyeing, and based on that, selects the amount of correction color to be combined with the target color using the relationship between the color unevenness intensity and the amount of correction color.

[0050] According to the hair dyeing method described above, the subject's hair can be dyed to the desired finished color simply and stably, regardless of the practitioner's sense or experience.

[0051] <Other variations> The above-described embodiment is merely an example, and the present disclosure may be modified as appropriate within the scope of the present disclosure. For example, the processes and means described in the present disclosure may be freely combined as long as no technical contradiction occurs.

[0052] For example, the present disclosure may be a hair product used in the hair dyeing method described in the above embodiment.

[0053] In this case, the hair product may be packaged as a kit including a hair dyeing agent for dyeing hair to the hue of the target color, a hair dyeing agent for dyeing hair to the hue of the complementary color, and a hair dyeing agent for dyeing hair to the hue of the correction color. Alternatively, the kit may include three hair dyeing agents for dyeing hair to the hue of complementary colors, namely cyan, violet, and magenta.

[0054] This allows the practitioner to easily dye the subject's hair to the desired finish color by using such a hair care kit.

Claims

1. A hair dyeing method for dyeing a subject's hair to a desired finish color, comprising: This hair dyeing method is characterized by dyeing hair using a combination of three hues: a target color that is a hue that is close to the finished color and contains a hue of the finished color; a complementary color that is a hue that cancels out the subject's hair color before dyeing; and a correction color that is a hue that adjusts for differences in pigments in the subject's hair before dyeing.

2. The complementary color is a hue for canceling out the saturation of the subject's hair color before dyeing, and is composed of any one of three colors: cyan, violet, and magenta. The hair dyeing method according to claim 1.

3. The complementary color is selected based on the brightness of the subject's hair color before dyeing, and when the brightness is a predetermined low level, cyan is selected, when the brightness is a predetermined medium level, violet is selected, and when the brightness is a predetermined high level, magenta is selected. The hair dyeing method according to claim 2.

4. The correction color is composed of a brown color. The hair dyeing method according to any one of claims 1 to 3.

5. The amount of the correction color is selected based on the color unevenness intensity, which is defined as the difference in brightness between adjacent hair strands in the subject's hair strands before hair dyeing, and the amount of the correction color is selected so that the higher the color unevenness intensity, the greater the amount of the correction color. The hair dyeing method according to claim 4.

6. A hair product used in the hair dyeing method according to claim 1, The hair product is a kit including a chemical for dyeing hair to the hue of the target color, a chemical for dyeing hair to the hue of the complementary color, and a chemical for dyeing hair to the hue of the correction color.

7. A hair product used in the hair dyeing method according to claim 2, The hair product is a kit containing three colored agents, cyan, violet, and magenta, which are agents for dyeing hair to the complementary hues.

Images