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I have tried the electrochemical etching method, but I find it's more of a pain in the butt than it's worth, really. It would probably be great with reusable vinyl resists, but with paint or standard...

I've been doing experiments with re-etching old razors. Here's an example:

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I used circuit board etching solution (which is, as I understand it, ferric chloride), electrical tape, and...