Question Regarding Cleaning Coins.

to the good place.

I understand you want to restore the change in order to be able to analyze.

Well, it is a big question and many contradictions here on this topic. I do restorations of coins, banknotes and artifacts. This kind is very costly and I do not think is your case.

Many will say pure acetone bath. Some how is good if you has coins who was in contact with petrol products or natural rubber. Acetone will clean a little bit, but if it is Cu will accelerate the brown color of the coin.

What I suggest you
1. it is boil the coin in Boric Acid in solution 40%(few bucks at pharmaceutics store) then wash with hot water and dry without been fronting.
2. Which is very funny and more natural: It is onion. Must be Yellow onion. Cut the onion, separate the leaves put the coin inside, squishy a few seconds, put under some pressure overs 12 to 24 hours. Then you squish the coin onto the leaf and the dry.

For dry the coins I use goldsmith tissue, alternative it is glasses cleaning tissue.

Those methods will not be able to dissuade the metal hard oxide. But at least the cooper coins will not go brown faster. The Silver coins which are almost black (in general the Peace Dullard) will need to be drip in onion juice for 24 hours.

For your knowledge: One month of this activity cost 60K for normal restauration and back 200K of machines.

Hope you will find the way to do very right.

@John1:
I agree with you. It is not a miracle solution for restoration. It is so complex then never ever someone could imagine. To made an artifact at his beauty take time, technology, a lot of knowledge and time to achieve. Me and my friend (alone I was not able) before to find out how to do properly, we was at the border of divorce. Him it is bio-chemistry and macro-chemistry PH and me I will not put my CV here, will work 5 (five) years for this and spend kilos of moneys to achieve our project. Now our wife are happy at least.

So: I give here just what we can do normally. And I say: No polish, use right drying material like glasses tissue cleaner and do not expect your coin will be like in museum.

For knowledge: To restore an artifact, the prices start from 1200$ for a coins.

Thank you so much for the wealth of knowledge you guys provide. I would like to clean some pennies that are a mess from circulation but look to have some chips and double strikes. I will post my finds and before cleaning.

Thanks T-BOP, appreciate. Try the onion trick, and please let me know after your opinion.