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<p>[QUOTE=&quot;robinjojo, post: 5042020, member: 110226&quot;]It likely is.&nbsp; Bronze is comprised primarily of copper, with a small amount of tin.&nbsp; Malachite is an oxide of copper, as is azurite and cuprite.&nbsp; Silver also oxidizes.&nbsp; Over everyday objects we call this process tarnish.&nbsp; If left to progress over an extended period, it can become patina.</p><p><br /></p><p>It appears that your coin was cleaned at some point, so the green oxide deposits might have developed subsequent to that.&nbsp; The rest of the coin, at least on the one side shown, is toning brown.[/QUOTE]</p><p><br /></p>

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