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<p>[QUOTE=&quot;Kentucky, post: 3110283, member: 33176&quot;]However, as commonly used in numismatics, verdigris (at least in things I have read) is used to refer to the form of copper corrosion that is also called bronze disease and is a destructive form of corrosion instead of a protective form.&nbsp; I think it is usually copper carbonate instead of copper chloride.&nbsp; That is why I referenced [USER=17261]@BadThad[/USER] who is a chemist who has worked in the metal treatments fluids industry for many years.&nbsp; I know you are a chemist, so am I and so is Thad.&nbsp; Treatments used by people not experienced in doing so are best left at an elementary level to prevent harm.&nbsp; Washing the coins in water and brushing them with a toothbrush would remove the looser material without damaging the coins or the protective patina.&nbsp; Treatment with VerdiCare will reduce any residual verdigris and protect the coin.&nbsp; Do a Google search if you are not familiar with VerdiCare.[/QUOTE]</p><p><br /></p>

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