Method for depositing coating that absorbs visible light at least partially on substrate

Abstract

The invention relates to a method (100) for depositing, on a substrate (1), a coating (20) at least partially absorbing visible light to form an article (10), the deposition method (100) being characterized by comprising: a first step (110) of providing the substrate (1); a second step (120) of depositing a first layer (21) covering at least a portion of the substrate (1) by applying a first liquid mixture; a third step (130) of depositing a second layer (22) covering a first portion of the first layer (21) by applying a second liquid mixture; a fourth step (140) of depositing a third layer (23) covering a second portion of the first layer (21) by applying a third liquid mixture, said second portion being different from the first portion covered by the second layer (23).

Description

Field of the Invention

[0001] The field of the invention relates to the surface treatment of articles, such as decorative articles or watch components.

[0002] The invention more particularly relates to a method for depositing a decorative coating having an optical characteristic of absorbing visible light.

[0003] The invention also relates to an article, such as a watch component coated with such a decorative coating that absorbs visible light.

[0004] The invention has a particularly interesting application in the watchmaking field for decorating articles or components used in watches, such as plates, cocks, gear trains, screws, oscillating weights, dials, indexes, appliques, aperture discs, hands or any other component of the movement or external components of the watch. Background of the Invention

[0005] There are coatings that absorb visible light and have a light absorption rate exceeding 99.8%.

[0006] In particular, coatings are known that are based on carbon nanotubes oriented perpendicular to the surface of the substrate and pressed against each other. Such coatings provide a black color with a visible light absorption coefficient of 99.965%.

[0007] However, coatings based on carbon nanotubes are very expensive and pose health risks, as these particles are known to be carcinogenic, mutagenic or reprotoxic.

[0008] Acrylic paints are also known, which are easier to use and apply, have a visible light absorption rate of up to 99.4% and a brightness component L* close to 10. However, this type of coating has the particularity of being very fragile, and slight contact with the coating can easily cause peeling of the coating or deterioration of its absorption rate. For example, if dust or fibers are deposited on it, it is very difficult to clean this type of coating without damaging its aesthetics. Such paints are not easily applicable in, for example, the watchmaking industry.

[0009] Therefore, there is a need to improve these coatings that absorb visible light so that they can be used on articles that can be processed, such as watch components, without health risks and without the risk of damage to the coating due to simple contact or handling of the article. Summary of the Invention

[0010] In this context, the object of the present invention is to provide an article having a coating with at least locally high light absorption and simultaneously avoiding the use of carbon nanotubes and / or graphene particles.

[0011] To this end, the present invention relates to a method for depositing a coating on a substrate, the coating at least partially absorbing visible light, to form an article, such as a watch component, the deposition method being characterized in that it comprises:

[0012] - a first step of providing the substrate;

[0013] - a second step of depositing a first layer covering at least a part of the substrate by applying a first liquid mixture, the first liquid mixture comprising a binder, a solvent and a pigment having a d90 percentile in the nanoscale, the first layer being formed by evaporating the solvent;

[0014] - a third step of depositing a second layer covering a first part of the first layer by applying a second liquid mixture, the second liquid mixture comprising a binder, a solvent and a pigment having a d90 percentile greater than the d90 percentile of the pigment in the first layer, the second layer being formed by evaporating the solvent;

[0015] - a fourth step of depositing a third layer covering a second part of the first layer by applying a third liquid mixture, the second part being different from the first part covered by the second layer, the third liquid mixture comprising a binder, a solvent and a pigment having a d90 percentile greater than the d90 percentile of the pigment in the second layer, the third layer being formed by evaporating the solvent.

[0016] According to the present invention, one of its objects is to propose a method for depositing a decorative coating having different visible light absorption levels, the deposition being easy to implement and producing a decorative coating with a luminance component L* that can be locally less than 20 using various substrates.

[0017] Preferably, the third step of depositing the second layer and / or the fourth step of depositing the third layer comprise: a sub-step of positioning a selective mask on the first layer before applying the corresponding liquid mixture in order to select at least a part of the first layer to be covered.

[0018] Preferably, the first liquid mixture for forming the first layer of the coating comprises 5 to 10% by weight of pigment.

[0019] Preferably, the second liquid mixture for forming the second layer and the third liquid mixture for forming the third layer respectively comprise 4 to 10% by weight of pigment, preferably 4 to 8% by weight of pigment, and 1 to 5% by weight of pigment, preferably 1 to 4% by weight of pigment.

[0020] Preferably, the deposition method includes a fifth step: depositing a fourth layer covering a third portion of the first layer by applying a fourth liquid mixture, the third portion being different from the first portion covered by the second layer and different from the second portion covered by the third layer, the fourth liquid mixture comprising an adhesive, a solvent, and a pigment having a d90 percentile greater than the d90 percentile of the pigment in the third layer, and the fourth layer being formed by evaporating the solvent.

[0021] Preferably, the fourth liquid mixture for forming the fourth layer comprises 0.5 to 5% by weight, more preferably 0.5 to 4% by weight, and even more preferably 0.5 to 1% by weight of the pigment.

[0022] Preferably, each layer of the coating is deposited by sputtering, spraying, dipping, screen printing, printing, or pad printing.

[0023] Preferably, the various liquid mixtures for forming each layer of the coating consist of an adhesive, a solvent, a pigment, an optional matting agent, glass beads, and / or a dispersant.

[0024] Preferably, the adhesive is a polymer.

[0025] Preferably, the adhesive is acrylic, an epoxy polymer, or polyurethane.

[0026] Preferably, the various liquid mixtures for forming each layer of the coating are colored inks.

[0027] The present invention also relates to an article comprising a substrate and a coating applied using the method of the present invention.

[0028] Thus, such an article has a light-absorbing surface coating with a brightness component L* of less than 20.

[0029] Preferably, the article is a clock component.

[0030] The present invention also relates to a clock comprising such a clock component. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The objects, advantages, and features of the present invention will be better understood after reading the detailed description given below with reference to the following drawings:

[0032] - Figure 1 A cross-sectional view schematically showing an article, such as a clock component, comprising a substrate and a coating that at least partially absorbs visible light according to the present invention;

[0033] - Figure 2 Showing the main successive steps of an exemplary embodiment of a method for depositing a coating that at least partially absorbs visible light on a substrate to produce an article, such as a clock component, according to the present invention;

[0034] - Figure 3An exemplary embodiment of an article according to the present invention is shown. Detailed Description

[0035] In this specification, the chromaticity properties of the light-absorbing coating obtained by the method of depositing a coating according to the present invention are represented using the CIE L*a*b* color space and are measured on a polished sample using a KONICA MINOLTA CM-3610-A spectrophotometer according to the CIE 1976 standard with the following parameters: illumination light source CIE D65 (daylight 6500°K), 10° tilt, SCI measurement (including specular reflection), measurement area diameter 4 mm.

[0036] The CIELAB color space (according to CIE standard no. 15, ISO 7724 / 1, DIN 5033 Teil 7, ASTM E-1164) has a luminance component L*, which represents the way the material reflects light and is assimilated with luminance, as well as an a* component as the green / red component and a b* component as the blue / yellow component.

[0037] In this application, the size of the particles and pigments is characterized relative to the d90 value of the particle size distribution. In the particle size distribution, using the d90 percentile means that at least 90% of all the particles or pigments used have a size below this d90 value.

[0038] Figure 1 A cross-sectional view schematically shows an article 10, such as a clock assembly, which includes a substrate 1 and a decorative coating 20 having visible light absorption properties.

[0039] The coating 20 covers at least a part of the substrate 1. Such a coating 20 according to the present invention forms a non-uniform structure composed of a plurality of regions with variable roughness, and different regions of the coating have pigments of different particle sizes.

[0040] Preferably, the pigment density between the respective regions of the coating 20 is also variable, preferably decreasing as the pigment size increases.

[0041] The article 10 is, for example, a clock assembly, such as a main board, pallet, bridge, wheel, screw, balance weight, dial, time scale, lettering block, window disc, pointer or any other component or part of a clock movement or an external component of a clock, which is intended to have a deep and intense color impression without light reflection and a luminance component L* less than 20.

[0042] Figure 3 A clock 200 including the article 10 according to the present invention is shown. In this exemplary embodiment, the article 10 according to the present invention is a dial.

[0043] The substrate 1 can have any properties, for example, it can be made of metal, polymer, ceramic or even composite material.

[0044] The method according to the present invention can be used to obtain an article 10 with a coating 20 having a luminance component L* less than 20 using various substrates. In contrast, due to the topology of the deposited layer, coating methods using physical vapor deposition (PVD) cannot be used to produce a coating with a luminance component L* less than 20. Using PVD, the luminance component L* of a matte coating is 25 to 30.

[0045] The multi-region structure of the coating 20 according to the present invention enables the creation of patterns by varying different levels of visible light absorption. Preferably, the multi-region structure of the coating 20 according to the present invention enables the creation of monochromatic patterns with different visible light absorption levels.

[0046] The coating 20 includes a first layer 21 forming a base layer, which is configured to cover the substrate 1 at least on a part of the substrate 1.

[0047] Preferably, the first layer 21 completely covers at least one surface of the substrate 1.

[0048] The first layer 21 has a thickness sufficient to ensure its uniformity and opacity and that optical interference from the substrate 1 no longer plays a role. For example, the first layer 21 has a thickness equal to or greater than 1 μm and less than 20 μm, and more preferably a thickness of 5 μm to 10 μm.

[0049] Preferably, the first layer 21 is formed by depositing a first liquid mixture containing a binder, a pigment, and a solvent on the substrate 1.

[0050] For example, the first layer is formed by depositing a first liquid mixture composed of 30 to 40 wt% of a binder, 50 to 60 wt% of a solvent, and 5 to 10 wt% of a pigment.

[0051] For example, the first layer is formed by depositing a first liquid mixture composed of 30 wt% of an acrylic binder, 60 wt% of a solvent, and 10 wt% of 1600 carbon black pigment.

[0052] Optionally, the first liquid mixture may further contain a matting agent, such as nano-silica, to further enhance the strength of the coating 20.

[0053] Optionally, the first liquid mixture may further contain a dispersant to help the pigment suspend in the liquid mixture.

[0054] Preferably, the binder in the first liquid mixture forming the first layer 21 is a polymer, such as acrylic, epoxy polymer or polyurethane.

[0055] For example, the first liquid mixture is a colored ink.

[0056] For example, the first liquid mixture is a black ink containing carbon black pigment.

[0057] The first liquid mixture is applied to the substrate 1 by, for example, sputtering, spraying, dipping, screen printing, printing, or pad printing.

[0058] Once the first liquid mixture is applied to the substrate 1, the solvent evaporates and the binder shrinks around the pigment, forming the first layer 21 of the coating 20.

[0059] Preferably, the pigment in the first layer 21 has a nano-sized d90 percentile, for example, 20 to 120 nm, preferably less than 100 nm. Thus, the first layer 21 is a uniform layer with low roughness.

[0060] The multi-region structure of the coating 20 is formed by a plurality of juxtaposed layers that respectively cover defined portions of the first layer 21.

[0061] As Figure 1 shown, the first layer 21 is covered by a second layer 22 in its first defined portion. The second layer has a pigment with a d90 percentile greater than that of the pigment in the first layer 21.

[0062] The first layer 21 is also covered by a third layer 23 at its defined second portion, which is different from the first portion covered by the second layer 22. This second portion may or may not be juxtaposed with the first portion.

[0063] The d90 percentile of the pigment in the third layer 23 is greater than that of the pigment in the second layer 22.

[0064] The first layer 21 may also be covered by other layers at its various specific portions to produce a specific pattern with specific optical characteristics and a light absorption level that varies according to the size of the pigment used.

[0065] For illustrative purposes, Figure 1 the exemplary embodiment shown in includes a fourth layer 24 that is partially deposited on a defined third portion of the first layer 21. This third portion is different from the first portion covered by the second layer 22 and also different from the second portion covered by the third layer 23. This third portion may be juxtaposed with the first portion and / or the second portion. These various layers applied to the first layer 21 are not superimposed on each other in any case.

[0066] The d90 percentile of the pigment in the fourth layer 24 is greater than that of the pigment in the third layer 23.

[0067] For example, the pigments in layers 22, 23, and 24 covering the first layer 21 have micron sizes.

[0068] For example, the second layer 22 contains pigments with a d90 percentile in the micron size range and less than 20 μm, such as approximately 15 μm.

[0069] For example, the third layer 23 contains pigments with a d90 percentile from 20 μm to 100 μm, preferably approximately 80 μm.

[0070] For example, the fourth layer 24 contains pigments with a d90 percentile from 100 μm to 300 μm, preferably approximately 250 μm.

[0071] Each of the layers 22, 23, and 24 that partially cover the first layer 21 is formed by depositing a liquid mixture via one or more masks applied to the first layer 21, thereby masking certain areas and exposing other areas intended to receive layers with a predetermined particle size.

[0072] Each of the layers 22, 23, and 24 that partially cover the first layer 21 is formed by depositing a liquid mixture containing a binder, pigments, and a solvent, with the d90 percentile of the pigments in the different liquid mixtures varying between the individual layers.

[0073] Each of the layers 22, 23, and 24 that partially cover the first layer 21 is formed by depositing the liquid mixture by sputtering, spraying, dipping, screen printing, printing, or pad printing.

[0074] After each mixture is applied to the first layer 21, the solvent evaporates to cause the binder to polymerize and shrink around the pigments, thereby forming the individual layers with different particle sizes.

[0075] Preferably, the binder, pigment properties, and solvent of the liquid mixtures used to form the deposited individual layers 22, 23, and 24 are the same.

[0076] Optionally, the liquid mixtures for forming the individual layers of the coating 20 may contain a matting agent, such as nano-silica, to further enhance the strength of the coating 20.

[0077] Optionally, the liquid mixtures for forming the individual layers of the coating 20 may contain a dispersant to help the pigments suspend in the liquid mixture.

[0078] Optionally, the liquid mixture for forming the coating 20 may contain glass beads to further increase the roughness of the coating.

[0079] Preferably, the binder in the liquid mixtures for forming the individual layers of the coating 20 is a polymer, such as acrylic, epoxy polymer, or polyurethane.

[0080] For example, the liquid mixture for forming each layer of the coating 20 is a colored ink, such as a black ink containing carbon black as a pigment.

[0081] Preferably, the binder, pigment properties, and solvent for forming each layer of the coating 20 are the same.

[0082] However, the pigments for forming each layer of the coating 20 can be different in nature between the layers and different compared to the pigment used for manufacturing the first layer 21.

[0083] Preferably, the pigment ratio in the liquid mixture for forming the layers 22, 23, 24 deposited on the first layer 21 is 5 wt% to 10 wt%. Preferably, the higher the pigment ratio in the liquid mixture, the smaller the d90 percentile of the pigment.

[0084] For example, the second layer 22 is made of a liquid mixture containing 4 to 10 wt%, preferably 4 to 8 wt% of a pigment.

[0085] For example, the third layer 23 is made of a liquid mixture containing 1 to 5 wt%, preferably 1 to 4 wt% of a pigment.

[0086] For example, the fourth layer 24 is made of a liquid mixture containing 0.5 to 4 wt%, preferably 0.5 to 1 wt% of a pigment.

[0087] Figure 2 Shows the main steps of a method 100 for depositing a coating 20 that at least partially absorbs visible light on a substrate 1 according to the present invention.

[0088] The deposition method 100 according to the present invention includes a first step 110 of providing a substrate 1.

[0089] The deposition method 100 according to the present invention includes a second step 120 of depositing a first layer 21 (referred to as a base layer) covering at least a part of the substrate 1. This second deposition step 120 is carried out by sputtering, spraying, dipping, screen printing, printing, or pad printing a first liquid mixture containing a binder, a solvent, and 5 to 10 wt% of a pigment with a d90 percentile in the nanometer size range (e.g., less than 100 nm).

[0090] This second step 120 of depositing the first layer 21 includes a sub-step of evaporating the solvent from the liquid mixture applied to the substrate 1 such that the binder shrinks around the pigment to form the first layer 21 of the coating 20.

[0091] The deposition method 100 further includes a third step 130 of depositing a second layer 22 that covers a first portion of the previously deposited first layer 21. The second layer 22 has a different particle size from the first layer 21. More specifically, the second layer 22 has a pigment with a d90 percentile greater than the d90 percentile of the pigment in the first layer 21.

[0092] The second layer 22 is deposited by sputtering, spraying, dipping, screen printing, printing, or pad printing a second liquid mixture that includes a binder, a solvent, and 4 to 10 wt% of a pigment.

[0093] Preferably, the second liquid mixture for depositing the second layer 22 includes 4 to 8 wt% of a pigment.

[0094] The third step 130 includes a first sub-step: positioning a mask on the first layer 21 to select the area of the first layer 21 to be covered by the second layer 22.

[0095] The third step 130 includes a second sub-step: evaporating the solvent of the second liquid mixture selectively applied to the first layer 21 such that the binder shrinks around the pigment to form the second layer 22 of the coating 20 on the first layer 21.

[0096] The deposition method 100 further includes a fourth step 140 of depositing a third layer 23 that covers a second portion of the first layer 21, the second portion being different from the first portion selected to receive the second layer 22. The third layer 23 has a different particle size from the second layer 22. More specifically, the third layer 23 has a pigment with a d90 percentile greater than the d90 percentile of the pigment in the second layer 22.

[0097] The third layer 23 is also deposited by sputtering, spraying, dipping, screen printing, printing, or pad printing a third liquid that includes a binder, a solvent, and 1 to 5 wt% of a pigment.

[0098] Preferably, the third liquid mixture for depositing the third layer 23 includes 1 to 4 wt% of a pigment.

[0099] The fourth step 140 includes a first sub-step: positioning a mask on the first layer 21 to select the area of the first layer 21 to be covered by the third layer 23.

[0100] The fourth step 140 includes a second sub-step: evaporating the solvent of the third liquid mixture selectively applied to the first layer 21 such that the binder shrinks around the pigment to form the third layer 23 of the coating 20 on the first layer 21.

[0101] As shown by way of example, the deposition method 100 may further include a fifth step 150 of depositing a fourth layer 24 covering a third portion of the first layer 21, the third portion being different from the portions previously selected to receive the second layer 22 and the third layer 23. The fourth layer 24 has a different particle size than the third layer 23. More specifically, the fourth layer 24 has a pigment with a d90 percentile greater than the d90 percentile of the pigment in the third layer 23.

[0102] The fourth layer 24 is also deposited by sputtering, spraying, dipping, screen printing, printing, or pad printing a fourth liquid that includes a binder, a solvent, and 0.5 to 5 wt% of a pigment.

[0103] Preferably, the fourth liquid mixture for depositing the fourth layer 24 includes 0.5 to 4 wt% of a pigment.

[0104] The fifth step 150 includes a first sub-step: positioning a mask on the first layer 21 to select the area of the first layer 21 to be covered by the fourth layer 24.

[0105] The fifth step 150 includes a second sub-step: evaporating the solvent of the fourth liquid mixture selectively applied to the first layer 21 such that the binder shrinks around the pigment to form the fourth layer 24 of the coating 20 on the first layer 21.

[0106] It goes without saying that the deposition method 100 may include other steps for depositing additional layers according to the desired pattern and properties of the coating 20.

[0107] According to a first exemplary embodiment of the present invention, a dial is formed using, for example, a brass substrate, and a light-absorbing coating according to the present invention is applied to the dial.

[0108] For example, the brass substrate has a thickness of 0.27 mm.

[0109] The first layer 21 is applied to the brass substrate by dipping in a first liquid mixture consisting of 2 g of polyurethane resin (Berlacryl), 0.5 g of Emperor 1600 carbon black pigment, and 2.8 g of Berlaflex diluent. The layer is dried for 20 minutes to evaporate the diluent.

[0110] The second layer 22 is applied to the first layer 21 through a first selective mask by dipping in a second liquid mixture consisting of 2 g of polyurethane resin (Berlacryl), 0.3 g of Living Ink pigment, and 3.5 g of Berlaflex diluent. The layer is dried for 20 minutes to evaporate the diluent.

[0111] The third layer 23 is applied to the first layer 21 through a second selective mask by dipping in a third liquid mixture consisting of 2 g of polyurethane resin (Berlacryl), 0.2 g of Norit A ultraE153 pigment, and 4 g of Berlaflex thinner. The layer is dried for 20 minutes to evaporate the thinner.

[0112] The fourth layer 24 is applied to the first layer 21 through a third selective mask by dipping in a fourth liquid mixture consisting of 2 g of polyurethane resin (Berlacryl), 0.2 g of Norit SX superE153 carbon pigment, 1.5 g of 90 - 150 μm glass beads, and 4 g of Berlaflex thinner. The layer is dried for 20 minutes to evaporate the thinner.

[0113] This coating produces a brass dial with a black surface coating and a brightness component L* of 16.

Claims

1. A method (100) for depositing a coating (20) which at least partially absorbs visible light on a substrate (1) to form an article (10), the deposition method (100) being characterized in that it comprises: - a first step (110) of providing a substrate (1); - a second step (120) of depositing a first layer (21) covering at least a portion of the substrate (1) by applying a first liquid mixture comprising a binder, a solvent and a pigment having a nanometer-sized d90 percentile, the first layer (21) being formed by evaporating the solvent; - a third step (130) of depositing a second layer (22) covering a first portion of the first layer (21) by applying a second liquid mixture comprising a binder, a solvent and a pigment having a d90 percentile greater than the d90 percentile of the pigment in the first layer (21), the second layer (22) being formed by evaporation of the solvent; - A fourth step (140) of depositing a third layer (23) covering a second portion of the first layer (21), the second portion being different from the first portion covered by the second layer (22), by applying a third liquid mixture comprising a binder, a solvent and a pigment having a d90 percentile greater than the d90 percentile of the pigment in the second layer (22), the third layer (23) being formed by evaporation of the solvent.

2. The method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 1, characterized in that: The third step (130) of depositing the second layer (22) and / or the fourth step (140) of depositing the third layer (23) comprises, before applying the respective liquid mixture, a sub-step of positioning a selective mask on the first layer (21) so as to select at least a portion of the first layer (21) to be covered.

3. A method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 1 or 2, characterized in that: The first liquid mixture forming the first layer (21) of the coating (20) contains 5 to 10% by weight of pigment.

4. A method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 1 or 2, characterized in that: The second liquid mixture forming the second layer (22) contains 4 to 10% by weight of pigment.

5. The method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 1 or 2, characterized in that: The third liquid mixture forming the third layer (23) contains 1 to 5% by weight of a pigment.

6. A method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 1 or 2, characterized in that: The deposition method (100) comprises a fifth step (150) of depositing a fourth layer (24) covering a third portion of the first layer (21) by applying a fourth liquid mixture, the third portion being different from the first portion covered by the second layer (22) and different from the second portion covered by the third layer (23), the fourth liquid mixture comprising a binder, a solvent and a pigment having a d90 percentile greater than the d90 percentile of the pigment in the third layer (23), the fourth layer (24) being formed by evaporating the solvent.

7. The method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 6, characterized in that: The fourth liquid mixture forming the fourth layer (24) contains 0.5 to 5% by weight of a pigment.

8. The method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 1 or 2, characterized in that: The individual layers (21, 22, 23, 24) of the coating (20) are deposited by sputtering, spraying, dipping, screen printing, printing or pad printing.

9. The method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 1 or 2, characterized in that: The various liquid mixtures applied to form the individual layers (21, 22, 23, 24) of the coating (20) consist of a binder, a solvent, a pigment, optionally a matting agent, glass beads and / or a dispersant.

10. The method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 9, characterized in that: The binder is a polymer.

11. The method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 10, characterized in that: The adhesive is acrylic, epoxy polymer or polyurethane.

12. The method (100) for depositing a coating (20) that at least partially absorbs visible light on a substrate (1) to form an article (10) according to claim 1 or 2, characterized in that: The various liquid mixtures applied to form the various layers (21, 22, 23, 24) of the coating (20) are colored inks.

13. Article (10), characterized in that It comprises a substrate (1) and a coating (20) which at least partially absorbs visible light and is deposited by a deposition method according to one of claims 1 to 12, the coating (20) having a brightness component L* of less than 20.

14. The article (10) according to claim 13, characterized in that The article (10) is a timepiece component.

15. Timepiece (200) comprising a timepiece assembly (10) according to claim 14.

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