Coin talk > Uncleaned
Numismatics on acid
Per D:
Apologies for the sophomoric pun.
Attacking some stubborn deposits on this follis with diluted phosphoric acid and a Q-tip was not only effective, but also resulted in (partial) restoring of the silvering, presumably through a process of surface depletion.
I won’t experiment on other coins, but I wonder if anyone has had a similar experience.
/Per
Heliodromus:
Do you have a "before" photo for comparison ?
Per D:
I forgot to take one myself, but here's the seller's photo.
Victor:
the silvering was there always, just covered. Whenever you see these coins with similar green, it usually means silvering; though it doesn't mean that the surfaces will turn out nicely.
Per D:
Thanks for your input, appreciated as always.
Do you have any ideas what would be a better/safer way to clean surfaces like this?
/Per
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