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 Aluminum develops a resilient natural oxide layer over time. Anodizing is an electrochemical process that accelerates this change in surface. Formed aluminum is first cleaned with acid. The object is immersed in an acid bath through which an electrical current is passed to develop the anodic film on the metal’s surface. The acceptance of colored dyes is a byproduct of the process. The anodic surface is porous and accepts dyes easily. A salt solution bath is used to tighten the pores around the color making it part of the surface. |
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