etch....??
I just remembered a question that I have been wondering for some time. What is "etch"? Ive seen it mentioned in caswells ano guide, but I dont think it actually says what it is or what it does. Ive seen it mentioned in other ano literature.....but still not mentioning the purpose, the chemical used, or anything. They all just say to "etch" the part. I give up, could somebody be kind enough to explain? Thanks
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