Not that I'm aware of. Certainly nothing as strong as, say, lemon juice. Plus, you're not soaking the coins in it. You just brush them with a toothbrush dipped in water and a little soap and then rinse them off.
I agree @Kentucky - And sometimes there is no way to get near to being able to identify a coin without sacrificing some of the patina. Several times I have happily found that under one patina is another. Here are a few of the coins that @Victor_Clark sent to me to work on. I am not finished working on these. But i wanted to take a break from cleaning Roman coins and work on Greek coins. I feel I am starting from square one because the designs or devices are so different. VC #5 Below is what I believe is a Greek coin. It is not one of the coins I got from Victor. Of course I am nowhere near finished tidying up this coin but I can begin to see a right facing profile of a man in the far left side of what I believe is the obverse. There appears to be a legend running down the middle of that same side. All I can tell about the reverse so far is that there seems to be a triangular incuse in the center. I know I have seen coins with a similar obverse but I can’t locate the website or book where I saw them. I love cleaning coins. I do not care if I only have ordinary coins. I am not praying to find a coin worth a gazillion dollars in a bunch of crusties. If I could I would have a collection like TIF or Zumbly or Bing, for instance, but that is not possible for me. I thoroughly enjoy these while I fatten my eye looking at the upper end coins owned and shared by others here. I am glad there is room for all of us to enjoy ancient coins in our own way.
I would be proud of any of those coins. I’d love to hear more about your cleaning methods. Very impressive.
Thanks @SeptimusT - I am still experimenting and there are still a half dozen ideas left on my “to try” list. I think I will be ready to post something in about a month if clients don’t keep interrupting me. I also agree about Noble Roman Coins. I have gotten good crusties from them although they took almost a week to arrive. The price is right. So yes, get a few dozen crusties to start. See if you like it - If you have the patience for it. There are many hours of work and strategic planning represented in the coins that I posted above.
I just ordered (cheap) this one and started soaking/brushing and started to uncover lots of silvering...I'm taking it easy with it. Funny thing, was looking on e-bay under generic "Ancient Coins" and ran into what I think it is...Crispus RIC 113 (VII)
Do you have an idea how you want this coin to look when you're finished cleaning it @Kentucky ? Do you want to see all the black gone and expose all the silvering? I see some thicker parts of black especially on the reverse. I might not have wet this coin, but I'm not sure since I have not seen it up close and personal. I'm not always of the mind that a coin should be wet in order to be cleaned. Is that black stuff gummy? or is it powdery? or a combo? Is it like tar? slick like ice? rubbery?
It seemed moderately hard and chalky, and as it started thinning down, I started to see the silvering. Just looked back to e-bay to see the one I thought it was, but things move so swiftly, I can't find it... Oh well, pictures to follow sometime.
Enjoy! I think i'll go work on some coins for a while now. p.s. Whenever you feel like it - I think it should stay there for a long time - you can always grab a picture of what you purchased from your ebay "purchases" list - you can save the photograph in that purchase to your pictures and always have it.
Dots on both top and bottom rows.. I'm not sure I've seen that before. What a sweet campgate. Nice cleaning job too.
a few mints have dots in the top row, but I don't recall seeing examples from any other mints with dots in the top and bottom