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Originally Posted by sanddrag
My understanding is that it is not a covering at all. Strong chemicals alter the chemical properties of the metal changing its color for the first couple thousandths of an inch or so.
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The anodized layer itself is not coloured--that is a dye added during the process (for example, Bosch structural extrusions are clear anodized 6063-T6 aluminum). It hardens the metal surface, but doesn't penetrate very deeply into the substance. The colour is certainly not all the way through.
Maybe what they're thinking of is a process like electrostatic paint application (similar in concept to powdercoating), where a conductive liquid paint with an electric charge is sprayed at a grounded object. The attraction increases the transfer efficiency of the coating, but doesn't produce any unusual effects w/r/t the metal's structure. Once again though, this doesn't much fit what they're describing.