Toned half dime evaluation

I did consider the discovered "hoards".
But I still think a lot of them were dipped to achieve the blast white look
which was popular before all the rainbow toning.
And even coins that were in bags, for an extended period of time,
they still should be toned and not blast white.

 

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No, not necessarily. The coins up close to the bag toned, but the majority of the coins in the bag weren't near enough to the canvas.

Just look at the GSA certified coins. There was no special treatment done to them (they were not dipped or cleaned... just shipped out as is). And yet a large number of the GSA Morgans are blast white.

 

I used to think that I would guess that a good 90% if not more have been subject to a quick rinse in a dilute dip of some sort. After going thru may original bags of Lincons from the 60's, I have found that that centrally located coins are as brilliant as the day that they were minted. The closer you get to the canvas carbon spots begin to show up on the surfaces. Every once in a while, you get a coin that has a solid brown appearance on one side (corroded). So, with copper being a very volatile metal I can see why a Morgan "not many" can stay a brilliant white if stored properly. I do believe that they are rarer than one may think.