Message:

<p>[QUOTE=&quot;Gao, post: 1246616, member: 19409&quot;]Well ancient bronzes often have the issue of what&#039;s called bronze disease.&nbsp; Basically, the chlorides in the soil the coin was in mix with the moisture in the air to form hydrochloric acid.&nbsp; This results in the coin slowly turning into a fine green powder, and it looks kind of like your coin is growing moldy.&nbsp; This can disintegrate an entire coin over time if left untreated.&nbsp; One really needs to treat such a coin with sodium sesquicarbonate or some other chemical solution to stop this, and it can strip artificial patinas.[/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