To Quote Ballymoss,,,, NOTE: When you drop the copper bar into place, if there are any signs of reddish brown fumes coming off, you must move the beaker outside.Those fumes are very bad for you, in fact they can kill you if you get enough inside of you.
I'm not targeting anyone here, but what the hell are you doing working with acids indoors. For this very reason this and any other posts pertaining to the refining of precious metals belongs over at the gold forum where the folks with knowledge of these things are able to correct a bad situation.
Never work indoors with out a fume hood.
Hokes Refining Precious Metals Wastes
Reactivity Series of Metals
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