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Tempering colors are produced when the metal is heated and a thin film of metal's oxide forms on the surface. They are dependent on the wavelength and angle of the incident light, the thickness of the oxide film, the refractive indices of the oxide material. This effect is called thin-film interference and occurs when a light is reflected from a thin oxide film.
When the phase difference between the two reflected beams is an even integer multiple of the wavelength of the beam in the film, then the two reflected beams tend to interfere constructively. If the phase difference between the two reflected beams is an odd integer multiple of the wavelength of light in the film, the beams destructively interfere. |
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|  |  | | Coating is off | Coating is on |
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| |  |  | | Coating color is [1, 1, 1] | Coating color is [0, 0.2, 1] | Coating color is [0, 1, 0.2] |
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| |  |  | | Transmittance is [1, 0.5, 0.1] | Transmittance is [0.1, 0.5, 1] | Transmittance is [1, 0.1, 0.5] |
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|  | |  | | Reflectivity is 0.15 | Reflectivity is 0.35 | Reflectivity is 0.65 |
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| |  |  | | Roughness is 0 | Roughness is 0.2 | Roughness is 0.5 |
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|  | |  | | Thickness is 0.01 | Thickness is 0.1 | Thickness is 0.5 |
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| |  |  | | Reflectivity is [0.4, 0.4, 0.4] | Reflectivity is [0.2, 0.4, 0.6] | Reflectivity is [0.6, 0.4, 0.2] |
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| |  |  | | Edge Tint is [0.9, 0.9, 0.9] | Edge Tint is [0, 0.5, 0.9] | Edge Tint is [0.9, 0.5, 0.0] |
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| | | | | | Roughness is 0.1 | Roughness is 0.2 | Roughness is 0.3 |
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|  |  |  | | Anisotropy is -0.8 | Anisotropy is -0.4 | Anisotropy is 0.4 |
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|  |  |  | | Direction is [0.5, 1, 0] | Direction is [1, 1, 0] | Direction is [1, 0.5, 0] |
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