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Letter 4042 How to black dye aluminum castings.- How should an aluminun die casting be anodized in order do dye it black. I've heard of a pretreatment using hydrofluoric acid with something else that will remove part of the silicion in the surface so you can get a clear coat that can be dyed. Does anyone knows how this works? Guillermo Luna - CENSA - Mexico City, Mexico
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