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<p>[QUOTE=&quot;desertgem, post: 1921637, member: 15199&quot;]It is the same chemical compounds from the reaction of active coin metal and environmental gases,&nbsp; water, and soil contaminates. The difference is that ancient coins can have hundred of years in different weather, what with flooding, droughts, etc where active reactions may occur in centuries with lots of rain or snow melt and then centuries of heat and drought that dehydrates the compounds. Most of the copper compounds exist in both hydrated and nonhydrated forms, this changes their color and crystalline arrangement. But BD, verdigris, and any other corrosion process is basically the same reactions over differing time periods.[/QUOTE]</p><p><br /></p>

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