What kind of toning is this?

This coin toned in my possession. It was pure white bullion when I bought it.
It is still a very white silvery coin.
The silvery look. It has some great mirrored fields.


The toning.

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It looks like it could have been on a windowsill in the sunlight or a wooden shelf with sun/light.

 

If it happened in your possession, then it must be a miracle happening. I mean did it happen right in front of you?
Like 4 D's said, probably in a weird spot over time it just happened. Mystery solved.

 

Unusual toning for sure, I would allow it to stay where it's at for more toning, both sides show that golden hue on the edges, very nice!

 

It wasn't a piece of cloth or sunlight.
Thanks for all the compliments. I will add that it was forgotten and just found.

 

Instead of thinking of where you found it i would look into what was with it. My daughter was given a solid white 1986 ASE; about 2 years later i found it in a comic book and it was terminal black.
I had a friend force a small group of white morgan dollars on me as collateral. I foolishly wrote some info on a business card and put it with the coins in a small metal candy box. a few years later i came across the box only to discover all the coins had developed some sort of edge toning. Somegood/some black tarnish bad; all in NGC/PCGS holders.
I find the toning odd since it seems stronger in the centers and weaker at the rims; the opposite of what i usually see in toning. james

 

That is the mirrored surfaces. The toning isn't darker.

 

If anyone wants to know the coin was in a dark yellow envelope. It had gotten pushed to the back of the drawer in my coin cabinet.

 

You know it is really odd how certain coins are more subject to tone than others. I won't lie and say that I don't play a little. I have many coins in envelopes. There are only a few that have toned over time. Others just as brilliant as the day I put them in there.

 

It is the Sulphur content in the old "manila" envelopes that REALLY rect with coins after a while.