Message:

<p>[QUOTE=&quot;desertgem, post: 2871571, member: 15199&quot;]? Where did this come from ?&nbsp; Verdigris is a metallic copper compound.</p><p>The acid that initiates the effect is almost always ( in the coin world) due to PVC plasticizers containing plastics. It is mainly Copper acetate and/or copper carbonates, whereas Bronze disease ( which needs moisture ) to initiate a copper chloride reaction towards hydrochloric acid formation&nbsp; ( see below URL for chemistry). Both are a copper compound&nbsp; formation problem. If water and PVC is removed from a coin with verdigris, the reaction will halt. If water is removed from Bronze disease, it will halt and form the crystal pattern that can be transferred to unaffected coins. BUT it does not move itself, it does not Jump. Disease is not a proper name to give such, as it is not alive nor organic. So both conditions are copper reactions, both require moisture. Once removed neither problem will return if proper storage conditions are maintained.</p><p><br /></p><p>Modern coins can get Bronze disease&#039;s classical symptoms as well as ancients can get Verdigris.&nbsp; </p><p><br /></p><p><br /></p><p><a href="https://www.brown.edu/Departments/Joukowsky_Institute/courses/greekpast/4867.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.brown.edu/Departments/Joukowsky_Institute/courses/greekpast/4867.html" rel="nofollow">https://www.brown.edu/Departments/Joukowsky_Institute/courses/greekpast/4867.html</a>[/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