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<p>[QUOTE=&quot;Troodon, post: 100773, member: 4626&quot;]Be interested in what more expert people would have to say, either way.&nbsp; I don&#039;t claim to be an expert by any means, and I haven&#039;t seen any wrong alloy errors, but I have seen a lot of corroded coins, and this looks similar to one.&nbsp; Wouldn&#039;t mind an education in wrong alloy errors at the expense of being proven wrong, lol.</p><p><br /></p><p>I&#039;ve seen a lot of Jefferson nickels corrode and tone in various ways... sometimes will turn slightly green, sometimes will look almost as if they rusted.&nbsp; It all depends on the chemical envrionment they end up in and the precise alloy mixture they have (not all nickels are prefectly 75% copper, 25% nickel... slight variations in the alloy are not all that uncommon, though more than about 3 or 4% variation is fairly rare).&nbsp; Most nickels seem to go slightly grey and tend to be stable if kept in the average circulating envrionment.</p><p><br /></p><p>The war nickels tend to go dark after a while... the copper/silver/manganese alloy tends to look a lot like dark pewter when they tarnish.&nbsp; I&#039;ve actually seen some war nickels where the field has darkened more than the devices, creating an attractive pewter cameo look.[/QUOTE]</p><p><br /></p>

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