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<p>[QUOTE=&quot;bcuda, post: 5194625, member: 105389&quot;]I know that ammonia is used to give a patina and will give that blue color to a coin. I had a Spanish guy show me how He did his coins that way. The ones He did looked more like your coin you posted [USER=99531]@Nvb[/USER] .&nbsp; I don&#039;t think I ever saw a single coin I dug up metal detecting for 5 years have that blue color.[/QUOTE]</p><p><br /></p>

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