How is it possible that, when you dunk a part with an etching mask in a bath of etchent, that the etchent can “know” which direction to work in? Surely, if you already have a pit in a part and it’s filled with somethign that wants to etch the metal, it will etch in all directions equally, because there’s no chemical difference between the side-walls of a pit and the bottom of the pit. Obviously this isn’t the case because anisotropic etching is something that’s used all the time in industry, but I cannot for the life of me understand the process.
In: Chemistry
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