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<p>[QUOTE=&quot;BadThad, post: 1184515, member: 17261&quot;]Heavy verdigris...it&#039;s a severe problem and you have to be very careful.....assuming the coin is important to you. Under the thick layers copper will have been removed from the surface, this results in a pit. Obviously, the older the verdigris, the deeper the pit and the greater the chance details may be removed along with the verdigris.</p><p>&nbsp;</p><p>Most ancient collectors like to use mineral acid or trisodium hydrogendicarbonate solutions. These are VERY harsh methods and must be monitored closely or you&#039;ll end up with a slug.</p><p>&nbsp;</p><p>VC will most likely only remove the light to moderate verdigris. That&#039;s what it&#039;s designed for. However, I have had a couple ancient collectors tell me some of the heavier stuff can succesfully be removed with soaking and a soft brush. I would soak it for 24 hours, then flip and soak the other side for 24 hours. Then, before you take it out of the solution, try using a toothpick to prod the remaining thick stuff. Maybe try a brush too. Take it out and let it completely dry for a few days at room temperature. There&#039;s no need to rinse the coin after soaking in VC, it&#039;s best not too so the ReAcT2 has a solid bond-layer over the remaining verdigris.</p><p>&nbsp;</p><p>Just be aware, sometimes it&#039;s better the leave severe verdigris behind! It can form a layer over the devices and kind of meld with it. If you remove it, you remove detail.....I&#039;ve had it happen to me many times. I think the remaining traces of verdigris lend character to coin sometimes anyway.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /></p><p>&nbsp;</p><p>Good Luck ...and let us know how it goes. Some after pics would be great![/QUOTE]</p><p><br /></p>

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