Discussion in 'Ancient Coins' started by Neal, Mar 22, 2018.
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Anybody have an idea the time period these would have been used for either purpose?
For those who may not be aware, that wonderful essay is written by CT's (and CCF's) own TypeCoin971793.
I didn't know that...
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Not likely. I've handled hundreds of thousands of Chinese coins and I have never seen or heard of one with bronze disease. That doesnt mean it couldnt happen, but I the metal composition combined with soil conditions makes for nice preservation. Somewhere around here I have a very boring metallurgical study of cash coins from the British Museum. I'd have to dig it out.
However, Chinese coins do have their own issues, and the OP coin illustrates it. Often they develop a light or pale green patina which is soft and is easily flaked off (and generally going in rather deep to the coin itself). You can see this on many European ancients as well.
Sounds like BD to me.
I took a couple of very quick photos (maybe I sized them too small) to illustrate but I think you can tell the idea. The first is a Wang Mang issue of the first Century AD, the second is from Cilicia in the 1st Century BC:
These coins are stable unless you bump them about or attempt to clean them. Its not BD.
@Ken Dorney , I see the difference in what you’re describing. What I had on my Ming coin was more brightly colored than that, came off as powder, and had a normal patina beneath it, so I’m not sure. I assumed it was BD, but maybe not. If it looks like it’s actually eating into a coin, though, I’d be concerned, but I’m terrified of BD. Never hurts to keep an eye on it.
Very cool coin, by the way, @Neal.
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