I’m curious…If a coin has been dipped, and it later starts to turn in the holder…if caught early enough, can it be conserved with acetone alone or does it need to be dipped in a chemical dipping solution again? Please only respond if you have actual knowledge of this process. I don’t want any guesses. And please don’t tell me the obvious (to send it in for conservation)…This is just a hypothetical question and for learning purposes only. So, that would defeat the purpose. Besides, they are pretty tight lipped regarding their procedures and would not tell me anything, anyway. Thanks.
Toning is corrosion. Acetone will have no effect, positive or negative, on corrosion. I assume what you mean by "turn in the holder" is that toning or corrosion has shown its face. Sometimes, that means that the coin was inadequately rinsed after its dip.
I’m talking about the coin developing residue from an improper rinse not from general toning or corrosion.
Acetone will not affect the toning. It needs to be dipped to remove the toning. If was given a correct dip and properly rinsed and dried then left out in the air for an hour or two it won’t tone again, unless the holder has an air leak. Dipping too long removes the coins luster. Not rinsing the coin properly is where most people make their mistake. The coin must be completely rinsed off and dried before holdering it.
