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anodizing etch

In my earlier question about etching prior to anodizing, I presented the
question as caustic etching vs. acid etching, which is incorrect. The
anodizing shop asking the question actually presently uses a cleaning
step followed by de-smutting, but no etch. So the question is, why would
he want to add a caustic etch in addition to the cleaning step, and why
not. sorry for the misinformation.