Is toning an active element?
topstuf
Posts: 14,803 ✭✭✭✭✭
Just wondering if the surface of a toned coin is also an "active" element.
We see examples of toning while in the slab. So, if it continues after being sealed from outside effects, is the surface itself now influencing the rest of the coin in the slab?
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Comments
It depends on the agents causing the tarnish and total exposure. Often, if caused by chemicals other than normal environment, there could be sufficient active residue to continue the process... particularly so with some AT coins... or dipped coins that were not sufficiently neutralized. Cheers, RickO
Yes.
Tarnish or toning is chemical and will usually continue unless the surface and environment are stabilized.
That is why I have never been a fan of the toned coins that command such a premium these days. Who knows what they will look like 10 years from now?
Constant temperature and humidity are critical to slowing down the process. Also UV exposure (sun light).
If anything got onto the coin to cause the tarnish, it needs to be removed.
The "old school" .......dipped. Just to start fresh. Now this was way before slabs.
My coin buddy and I dipped ...most... newps.