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Author Topic: Is this horn silver? IVLIA PAVLA denarius  (Read 669 times)

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Offline Ron C2

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Is this horn silver? IVLIA PAVLA denarius
« on: December 06, 2020, 12:53:36 pm »
Hi all,

I guess because I collect severan period debased denarii I don't often encounter horn silver and have little experience deciding if an encrustation is horn silver or just old dirt & minerals. From what I have read, copper-alloyed silver is generally much less susceptible to horn silver corrosion.  

This coin has a few pin-point size encrustations that are lead-colored, which I know is the color of horn silver, but I don't usually see photos of it that look this small and isolated to little bits.  I've only had the coin a short while, so it's not like I would see the progression yet.

Just in case, and on the general idea that I will encounter horn silver eventually - after reading up on it I ordered some sodium thiosulphate powder online just in case - won't have it for a week or two though.

Most of it is around the L in IVLIA, but there are very tiny specs of it on both sides of the flan in isolated areas.



Should I do a precautionary sodium thiosulphate bath with a DW soak just in case?
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Offline Callimachus

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Re: Is this horn silver? IVLIA PAVLA denarius
« Reply #1 on: December 06, 2020, 11:23:21 pm »
Quote: ". . . so it's not like I would see the progression yet."

Horn silver is not the same as bronze diseaseBronze disease can eventually destroy a coin, but i think horn silver is fairly stable.

From your picture, it appears the coin is lightly toned. I would not do anything to it that would get rid of that toning.

Offline Ron C2

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Re: Is this horn silver? IVLIA PAVLA denarius
« Reply #2 on: December 07, 2020, 04:13:50 pm »
I don' think sodium thiosulphate removes toning? But even if it did, silver retones naturally after a few years.
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