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Is this horn silver?

Harry G

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Hi all!

I've had this coin in my "miscellaneous" pile for a while now:


I have a (very) limited knowledge of Parthian coins, but I think it's a decently scarce beardless drachm of Pakoros I from Ekbatana (78 - 120AD).

Unfortunately, the coin has some very hard red deposits, which I have been unable to remove with my dental pick.

Is this some form of horn silver? If so, would Sodium Thiosulphate help?

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Sometimes the partial red colouring can give a coin a bit of character


Troas , Gergis. Circa 4th-3rd Century BC. AE12mm, 1.28 g. Head of Sibyl Herophile right, three-quarters facing / ΓEΡ, Sphinx sitting right. SNG von Aulock 1515; SNG Ashmolean 1147; SNG Cop 338


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