Discussion in 'Ancient Coins' started by Strizzle, Jun 19, 2021.
RIC II.3# 859
RIC II.3# 3072
I also got a USB microscope for better pictures
Log in or Sign up to hide this ad.
will come off with enough time.
I left it in for 4 days already!
This one is low-grade billon silver, but the point stands.
I fail to see why sodium thiosulphate should work? It’s not a magic bullet - it dissolves silver chloride and bromide, but that’s about it. Note that coins that are pitted due to corrosion, and then covered by AgCl will not be better of with this treatment either.
That being said: I would soak this coin in synthetic citric acid, dissolved in distilled water, heated to boiling point.
When I use citric acid, it tends to leave a rather dull gray surface. Maybe I’m doing it wrong
I also fail to see why sodium thiosulfate should work against iron oxides, but in all my experiments it has been the one thing that works against rust. I don't know why, as the chemistry doesn't point to thiosulfate being effective against it!
Where do you purchase Sodium thiosulfate? Never heard of it.
I get it from eBay. It's like $8 for a small bottle, pretty cheap. Works wonders for silver coins!
4 oz bottle
If you want a TON (5 pounds) it's a better value
Separate names with a comma.