What causes blue residue on a penny?

2007-01-24 00:00:59 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

Salts of copper are typically blue or blue-green.

2007-01-24 00:05:44 · answer #1 · answered by Jerry P 6 · 0⤊ 0⤋

High acidity from whatever reacts with the copper. Alot of copper plumbing pipes have the same reaction.

2007-01-24 08:07:21 · answer #2 · answered by rich11 2 · 0⤊ 0⤋

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