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<p>[QUOTE=&quot;NSP, post: 2179362, member: 74849&quot;]While rust and toning both are examples of a metal reacting with its environment, the reaction on a silver coin is self-limiting, meaning once the toning/tarnish/patina forms, it protects the rest of the coin&#039;s interior from oxidizing. Rust, on the other hand, is not self-limiting. Rust on the surface of an iron object doesn&#039;t protect the rest of the object from oxidizing. While both reactions are technically environmental damage (sort of), the silver toning reaction is protective and helps preserve the coin. Plus toning looks pretty nice as an added bonus.[/QUOTE]</p><p><br /></p>

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