David Weiss
@David, Are you sure you're not confusing HCl with fuming H2SO4? HCl is pretty 'mild' as far as strong acids go, and it certainly doesn't fume in a 20 baume solution. I've used it many times in the past to clean copper, and it often works beautifully. Some H2S is made when the copper sulfides are reacted, but not a huge amount. Enough to be rather smelly, though. -Adam
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