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  • PaulD117 commented on goldscott's instructable Anodize Titanium!11 months ago
    Anodize Titanium!

    The colors obtained by this method are "interference" colors that arise because the top surface of the somewhat transparent titanium oxide has a reflectivity (for light) that is comparable to the reflectivity of the titanium metal that is under the oxide. The colors have some similarity to the "temper colors" that you can be seen on plain carbon steel when it is heated. To get this effect requires two things :1. the oxide thickness is roughly the same length as the wave length of visible light2. oxide and metal have similar reflectivity for visible light.It won't work for aluminum because aluminum oxide isn't reflective enough.The wavelength of light varies with it's color.For more, google "carbon steel temper colours" pdubya, BSc, MSc, PhD (all in metal...see more »The colors obtained by this method are "interference" colors that arise because the top surface of the somewhat transparent titanium oxide has a reflectivity (for light) that is comparable to the reflectivity of the titanium metal that is under the oxide. The colors have some similarity to the "temper colors" that you can be seen on plain carbon steel when it is heated. To get this effect requires two things :1. the oxide thickness is roughly the same length as the wave length of visible light2. oxide and metal have similar reflectivity for visible light.It won't work for aluminum because aluminum oxide isn't reflective enough.The wavelength of light varies with it's color.For more, google "carbon steel temper colours" pdubya, BSc, MSc, PhD (all in metallurgy)

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