What does the stained designation on a coin indicate?
![goldrealmoney79](https://w2.vanillicon.com/23c058aab665667f5193610996554e1b_100.png)
I saw this coin recently, proof trade $, https://www.ebay.com/itm/204427729130?
that has a stained designation, but to me looks like toning, I was curious how can differentiate stain versus toning? Also how does one even stain a coin? Is staining the same as artificial toning?
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Comments
Paint would stain it and not be toning.
Stain is a foreign substance not toning.
Stain is not the same as artificial toning.
I think that on occasion, dipped coins with unsightly remnants of toning or dip residue might be designated “stained”.
Mark Feld* of Heritage Auctions*Unless otherwise noted, my posts here represent my personal opinions.
NGC Details Grading
"Stained" is listed under "environmental effects".
The first thing that came to mind when I looked at the coin image was gun bluing. Not sure why that would be called staining rather than AT though.
Mr_Spud