Cryptocurrency Q&A
Why do coins turn black?
Why do coins turn black?
Andrea
Mon Nov 25 2024
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6 answers
1751
Coins often turn black due to the formation of copper sulfide, which occurs when copper reacts with hydrogen sulfide or solutions containing it, especially in moist environments. This chemical reaction can be accelerated by perspiration, as it contains sulfur-containing molecules that can break down to form hydrogen sulfide.
6 answers
Giuseppe
Wed Nov 27 2024
Silver coins, particularly those with a toned appearance, often undergo a transformation over time.
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Sara
Wed Nov 27 2024
This transformation manifests as a dark patina that develops on the surface of the coins.
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BlockchainBaronGuard
Wed Nov 27 2024
The cause of this darkening is a chemical reaction between the silver and the sulfur present in the air.
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Michele
Wed Nov 27 2024
This reaction is natural and occurs gradually as the coins are exposed to the elements.
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CryptoEagle
Tue Nov 26 2024
When coins are stored in certain ways, such as being stacked in an older mint bag or crammed into an envelope, they can develop unique toning patterns.
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