I've done plenty of research and that is the last question I couldn't find an answer for. What viscosity is best for not affecting the coins patina/condition? Highest or Lowest? I plan to remove the coins with dirt on them in my collection. I'll post a penny I'm thinking about doing it with, because it looks like it could be a good error, but it's hard to see with the "dirt" on top. What do you think about this one? I'm planning on only cleaning only the coins I have to, with a sealed glass jar and mineral oil, followed by distilled water to carefully remove the pure oil afterwards.
What I think is that you need to re-think a few things. First of all that appears to be heavy verdigris on the coin, and mineral oil will have little to no effect on it. If I were going to try removing it I would use Verdi-Care. Even olive oil, which is slightly acidic, will likely have little to no effect. Secondly, I do no think that is an error underneath all that corrosion. It looks to me like somebody was playing around with a brazing rod, flux, and heat. I would just throw the coin away. Thirdly, ever hear that oil and water do not mix ? Distilled water will not remove mineral oil, or any oil. But if you are intent on going through with your experiment, use xylene to remove the oil when you are finished with it.
You don't think 6 months to 1 year would have any effect with mineral oil? I'll probably pick up verdi-care as that was my second choice. And I wouldn't use olive oil due to the fats and light acids included. I was going to use xylene if I couldn't get rid of the oil without it. Thanks for your incite. And you can never be too careful with errors. By the way you shouldn't throw currency away.
Your coin looks like it has a glob of glue on the obverse side with paper fragments on top the glue. if this is the case and I believe it is the glue has protected the area it is covering and kept it nice and shiny looking. if you want the glue off find something that will dissolve the glue , like say maybe nail polish remover . if you don't want to keep the coin then the glue could simply just be scraped off.
I was actually joking about that part because GDJMSP said to throw the coin out. I know it's a figure of speech. And I was saying was I don't know if it's an error, and wouldn't want to use it if that's what it actually was. From what you knowledgeable fellows said though it seems to just be damaged. Also for reference, what's the answer to the viscosity question? I know the viscosity affects the thickness/flow of the liquid, but I'm not sure what else. Which viscosity would be the best choice highest or lowest?
I don't think it would make any difference because to begin with, mineral oil would have virtually no effect on the verdigris.
Looks like it has glue on it that will probably come off fairly easily with a soak in water or acetone. The only "error" I see is die deterioration doubling (Poor man's doubled die)
