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I make a Fuzz face (you know the round one) but I "tune" the amount of voltage going through the Germainium (or silicon if you prefer Jimi's later sound) transistors, so the fuzz is nice and as you...

You might laugh at this but, I make Fuzz Boxes !! You know the little device Jimi Hendrix used to get that distorted sound...........? Well anyway, I use chemical etching acid to make circuit boards....

Could you cover the edge area with something so that the chemical wouldn't cause the edge to "blue" ?