Silver metal in atmosphere is oxidation. With the oxygen in the air with moisture
substance that is often made of metal surface black money by the compounds of sulfur, which is often H2S comes from burning fuel
.The reaction makes skin look in the atmosphere H2S money is
2Ag H2S 1 / 2 O2 - > Ag2S H2O
when in an atmospheric sulfur is born. Copper sulfide (Cu2S) surface, due to Sulfidation rate reaction of copper occurs faster than money!
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