I played around with copper sulphate. It worked well except for two issues:
1) It attacks and eats nickel. All my barbs are bright nickel plated, but it didn't take long for them to turn into a rusted metal appearance due to the copper sulphate.
2) The solution in water is highly electrically conductive. I've spilled water plenty of times over the internals of my computer. Never had a problem after a quick dry in the sun. With the copper sulphate solution a spill took out my CPU, and my motherboard, and nearly claimed the video card as well.
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