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Electro-chemical oxidation of aluminum in a sulfuric acid electrolyte results in a thin, porous layer of aluminum oxide. Those pores are a perfect receptor for organic dyestuffs; the same dyestuffs used to color printing ink, plastics and textiles. Nearly any color can be incorporated into a properly anodized layer with the exception of white. One of the limitations of organic dyes is that they can begin to fade when exposed to light, temperature and/or certain chemicals. The ability to resis…
