Author Topic: How could one treat a Sasanian lead coin?  (Read 78 times)

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Online Pellinore

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How could one treat a Sasanian lead coin?
« on: February 17, 2021, 09:30:44 AM »
In the course of 2019-2020 a number of (formerly very rare) lead Sasanian coins came onto the market. These are small and unremarkable, having the same types as the small copper coins. I bought a few of these in mediocre condition, but they all came with white encrustations. Would it be possible to do something about this safely? For instance, this one, a pashiz of Shapur II, much like a pashiz from Stephen Album, that has even more white on it.

On the reverse of my coin, there appears to be some lettering at the sides of the altar attendants that I'd like to study.
15 mm, 1.80 gr.

-- Paul

Offline THCoins

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Re: How could one treat a Sasanian lead coin?
« Reply #1 on: February 17, 2021, 03:22:15 PM »
I'm not a chemist. But if you have several, you might just experiment with the most far gone specimen.
But offcourse, no experiment without risk ! Leadcompounds may be toxic also through skin contact !

I can imagine the surface material consisting of leadsulfate, leadoxide and/or lead carbonate.
What I would try first is brushing in a weakly acidic watery solution.