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Just an FYI: do NOT mix the hydrochloric acid, hydrogen peroxide, and the acetone together. Not that a person would do this...but it's possible someone might dispose of the stuff together or accidentally combine them. It can form acetone peroxide, an unstable (or, at least, very sensitive) explosive. Read about it on Wikipedia, that article explicitly referenced PCB etching with these chemicals. I'd encourage everyone to read it directly and not just take my word for it.
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