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<p>[QUOTE=&quot;TIF, post: 2650152, member: 56859&quot;]It&#039;s hard to say, but there does appear to be fairly good correlation between thickness of the makeup and intensity of green/corrosion.&nbsp; There were others in the group that had less green showing outside of the makeup but which had verdigris under the makeup.</p><p><br /></p><p>Regardless-- would <i>you</i> trust a bronze, billon, or potin coin which had an unknown substance slathered on? </p><p><br /></p><p>I will remain highly suspicious of any applied patinas.&nbsp; You can easily envision how the chemical makeup of certain patinas might hasten deterioration.&nbsp; Slightly acidic wax or makeup on a potin tet?&nbsp; Bad news.&nbsp; For similar reasons I&#039;m also mistrustful of certain conservators&#039; patinas.&nbsp; If a coin has been repatinated, and I&#039;m not against that in general, I want to know which patina recipe was used.&nbsp; (Heh, that&#039;s not going to happen).</p><p><br /></p><p>I routinely give at least a cursory &quot;cleaning&quot; to incoming bronze coins if there is any sign of anything having been applied.[/QUOTE]</p><p><br /></p>

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