What causes ring toning on one side only?
oih82w8
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I just picked up a PCI slab for my slab type set. I consider it a nice addition, but am curious about one sided, ring edge toning. The reverse is blast white.
Thank you for interest and comments!
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I wouldn't put much faith into that holder. It's a nice looking coin. Chances are its artificially toned. I could be wrong.
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The paper insert’s ozone to that side of the holder due to seal line that hermetically sealed access to back side of the holder but not the front I would guess
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I just read another recent post about the propensity of this ring toning in PCI holders. Curious to say the least.
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What causes ring toning on one side only?
Part one.
There has to be some kind of...
cat·a·lyst
/ˈkadləst/
noun
a substance that increases the rate of a chemical reaction.
without itself undergoing any permanent chemical change.
In this case, what caused the one-sided toning is the fact that it was artificially applied.
On the web: http://www.earlyus.com
I’ve seen coins in albums (not talking about folders) tone on one side only, or significantly more so on one side. To balance them out, I’ll reverse them in the album for years. Even then it doesn’t always work. In those cases I assume either the “catalyst” has been consumed, or something on the surface of the lesser toned side is preventing it.
I would guess that it could be a coating on one side of a holder, maybe the PCI slab, maybe an album. Albums or holders that have a surface material that differs from the rest of the holder could be the cause. Maybe the obverse was in direct contact with a surface covering (like the blue material over the cardboard of a Library of Coins or Whitman folder) while the reverse wasn't.
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