Author Topic: Uncleaning a coin  (Read 1028 times)

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Offline capnbirdseye

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Re: Uncleaning a coin
« Reply #15 on: October 29, 2017, 08:38:29 PM »
That's impressively quick, Vic.  :)


Yes, it is fast if you drop it in the powder but as I mentioned earlier suspending it in a jar is slower and is best for machine struck coins such as yours,  you need to make it  suspend upright, if the coin lays on it's side then the upper part will darken more as the suspended sulphur powder will settle on it
Vic

Offline mrbadexample

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Re: Uncleaning a coin
« Reply #16 on: August 07, 2018, 06:53:22 PM »
How much powder do you use in the water please Vic? I've finally picked up some sulphur.

A for the original coin, it seems that being a pocket piece is helping. It's slowly coming back to a nice brown colour, although still a bit pink around the edges. I think I'm winning.

Offline capnbirdseye

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Re: Uncleaning a coin
« Reply #17 on: August 07, 2018, 08:23:39 PM »
How much powder do you use in the water please Vic? I've finally picked up some sulphur.

A for the original coin, it seems that being a pocket piece is helping. It's slowly coming back to a nice brown colour, although still a bit pink around the edges. I think I'm winning.

You will have to experiment a bit, for a regular sized jam jar full of water I would add a tablespoonful and shake it up, most of it will soon end up on the bottom but the water will have a golden tinge and this is what will produce the most delicate toning in just a few hours
Vic

Offline mrbadexample

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Re: Uncleaning a coin
« Reply #18 on: August 20, 2018, 08:26:14 PM »
A test piece. It was troubled by verdigris, especially on the top half of the reverse. I forgot to take a photo before I started, sadly, but this is it after some time in lemon juice:

Offline mrbadexample

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Re: Uncleaning a coin
« Reply #19 on: August 20, 2018, 08:30:28 PM »
And after a few days suspended in water with a tablespoon of powdered sulphur in.

I think it is much improved, although unevenly toned. The toning is darkest where the verdigris was, so I am attributing this to the degradation of the surface which presumably increased the reactive surface area.

I might try keeping it in my pocket for a couple of months to see if it will improve further.