Thanks For This Wonderful Resource! Black Beauty Error Quarter?

Looks like a coating. I think I see silver color coming through the scratches on the coin?

Are you sure it isn't a coating, and how? I have seen coins that appeared to have been blued, kind of like the way steel is blued on many firearms. It is a coating, but not like paint, varnish or glue.

Also heat can make many metal alloys turn colors. A dark blue color can be imparted as post mint damage from fires or people just playing around with a flame.



This dime shows evidence of such an effect. It's worth ten cents, and a dirty look from the recipient. Not saying your quarter is positively a victim of pyro-vandalism, but...

For a coin that is not found in original government packaging, I don't know how (Although there are many things possible which, "I don't know how...") one can confirm without a doubt that it is a "Black Beauty". My understanding is that the color came from improper annealing. So, that mint error itself is a form of heat damage.

Definitely NOT a mint error. It did not, could not leave the mint looking like that. This coin appears to be like many we see here on the pages of CCF with names like "Black Beauty" nothing more than most likely rubbed with gun metal oil, which gives coins the tell-tail blueish dark colour. This is not a missing metal issue, there is nothing in the minting process that would account for this colour coin. Not worth third party grading. Value: 25 cents.

to the CCF! Best of luck with future finds; Keep searching!