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<p>[QUOTE=&quot;medoraman, post: 1631306, member: 26302&quot;]Sometimes you must if you are going to preserve the coin. Having such thick, heavy toning is not the best thing to have in place if there is danger of the toning progressing. If you are borderline dangerously crossing over from toning to corrosion, if you dip the coin you can lessen the likelihood it will develop into corrosion. IOW, removing the toning layer will cause the coin to have to reform the toning layer again before corrosion can happen, so sometimes we have to dip to save the coin from damage.</p><p><br /></p><p>Also, Bill you will be a little bit out of place if you are equating black toning on most ancients with this topic. Most ancients with black toning is an old, hard toning formed over centuries. It may be chemically similar to this issue, IDK, but I find ancient shiny black toning very stable and not susceptible to going into corrosion as modern black toning. I am with you, I LOVE dark toning, and with ancients I can relax about it and not worry as much since it is by its nature a more permanent toning than moderns have. If I ever saw a denari turn from colored to dark in my lifetime I would worry, and follow the same logic as we are discussing here. For ancients that have been black since they came out of the ground, I would not really worry about them. Remember, our ancients are tough coins, as opposed to these wimpy little modern ones. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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