Tape Residue?

Thanks for the MSDS, that is the brand I have. It says 100% acetone but it wouldn't surprise me if it's tinted with an emetic agent, which I've never known the name for! I've only know it as how they denature alcohol to avoid consumption of hand-sanitizer! Thanks for all they help guys.

 

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Same two coins from last night. Edit: no change to toning despite overnight soak in acetone.

 

Aha! I’ll take your (and literally everybody else’s) word for it! Not sure why I was so skeptical, lol. I will have to try it when i come back, as I leave for Wisconsin tomorrow and come back the 1st of July. How long should I soak it? Or was that already in your instructions? Ill have to check...

 

Skepticism is not always a bad thing. I struggled with such worries as well, but it’s because the last (and not) chemistry course I took was over 10 years ago. After listening to a few folks who knew what they were talking about, I caught on.

A few things: never mix copper coins with non copper coins. You’ll get copper wash, which will permanently stain your other coins.

Most recommend this order, 30 minutes soak each:
Water, acetone, xylol (if you have it, I don’t), acetone, water. Ensure after each soak, that you agitate the coin in the solution prior to putting it into the next solution, to prevent particles from settling on the coin.
Ensure the coins are 100% dry (wait a few hours if you have to) between soaking solutions. Water and acetone react together.
Keep your acetone out of sunlight and away from heat.
Seal your acetone soak container as best as possible.
I have done many overnight water and acetone soaks with zero damage to my coins. Unless your coin is a strange composition metal, like many coins out of Africa, you’ll have no issues.

Does this help?

 

Yes it most definitely does! I like to think I'm generally good with chemistry, but wasn't sure how the products of toning (which are probably silver sulfides) would interact with acetone, but now I know! I don't have xylol though, it's a little dangerous.