Freezing And Heating Uncleaned Coins

echizento- Yeah, I kind of thought that that would happen as well. But have you ever heard any success stories relating to this method?

I guess that this method treatment would yield varying results, depending on the individual coin, and it's depth of 'patination'.
I have seen some late Roman bronzes where there is little of the original bronze left, to the point of none at all. All of the specimen was just 'patination' although it did look otherwise OK. In other instances, there would be a substantial amount of bronxe left.

I have heated a late Roman bronze in an oven (I can't remember the temperature), and the coin just broke into black particles when cooled. Total loss.

Fortunately, the coin was only a cheapie, but I am not inclined to repeat this method of treatment again.

I tried it once. I froze the coin then dropped it into boiling water. I did it twice and nothing happened. Still just as cacked as before.
I used a coin that was impossible to clean and did this as a last resort. It might work better on a coin that is in fact cleanable.