Some coins are removed during an archeological excavation. They are reported to be silver but they do not look like. They are greyish black in colour. What could be the reason?
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hey mate, here's your answer
silver react with h2s (hydrogen sulphide) present in the atmosphere to for silver sulphide that leaves behind a grey coating on silver articles
silver react with h2s (hydrogen sulphide) present in the atmosphere to for silver sulphide that leaves behind a grey coating on silver articles
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