Message:

<p>[QUOTE=&quot;alurid, post: 4584812, member: 81991&quot;]I have always considered that Green residue a type of verdigris from the 10% copper in the coin. It is not dry and hard like a patina on brass or bronze. This type is soft and wax-like, possible due to the lack of or very low concentration of oxygen or mixing with other chemicals from being stored in plastics. Most plastics are a byproduct of oil.</p><p>&nbsp;It can form on gold coins also due to the 10% copper content in some of them. I would say that coin has been in the same storage condition for a long time and the green has occurred naturally. JMO</p><p>&nbsp;I have had several silver coins that turn my acetone green while soaking.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in