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<p>[QUOTE="TIF, post: 2647772, member: 56859"]A fourth point to add: the opaque applied coloring might be actively harmful to the coin.</p><p><br /></p><p>I bought a group lot of Alexandrian tetradrachms some time ago. Most of them had a distinctive beige "sand" patina which I strongly suspect was makeup.</p><p><br /></p><p style="text-align: center">[ATTACH=full]585187[/ATTACH]</p><p><br /></p><p>Here's an example from that lot, a before and after, with most of the makeup removed. It sure looks like the makeup itself<i> caused</i> corrosion.</p><p><br /></p><p><img src="https://www.cointalk.com/attachments/cng-numerian-e4022-3-3-obv-fakepatinabeforeafter-jpg.326628/" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>It took many alcohol soaks to remove the makeup, and then I had to treat them with Verdicare. I check them periodically to see if there the corrosion is active.[/QUOTE]</p><p><br /></p>
[QUOTE="TIF, post: 2647772, member: 56859"]A fourth point to add: the opaque applied coloring might be actively harmful to the coin. I bought a group lot of Alexandrian tetradrachms some time ago. Most of them had a distinctive beige "sand" patina which I strongly suspect was makeup. [CENTER][ATTACH=full]585187[/ATTACH][/CENTER] Here's an example from that lot, a before and after, with most of the makeup removed. It sure looks like the makeup itself[I] caused[/I] corrosion. [IMG]https://www.cointalk.com/attachments/cng-numerian-e4022-3-3-obv-fakepatinabeforeafter-jpg.326628/[/IMG] It took many alcohol soaks to remove the makeup, and then I had to treat them with Verdicare. I check them periodically to see if there the corrosion is active.[/QUOTE]
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