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<p>[QUOTE=&quot;desertgem, post: 2028674, member: 15199&quot;]Is the piggy bank made of plastic? If not it is copper corrosion. If it is PVC plasticizers that caused it, they can be removed by acetone, but if corrosion occurred under the pvc action, or just plain old corrosion from the environment, acetone can&#039;t help. Copper sulfide causes a dark brown/black color, blue green is probably copper carbonate mixture. You should still be able to evaluate most for errors, varieties, even like they are.[/QUOTE]</p><p><br /></p>

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