I recently came across a Connecticut State Quarter and the surface seems frosted, it isn't perfectly frosted and it isn't proof. I'd like to know if anyone else has seen this in other coins. Thoughts, comments?
Can't tell until I see the picture but I have seen something like what I think you are describing. I believe it is from a chemical that the mint uses to wash the planchets and it was not completely rinsed off before the coin was minted. I have no facts to back up my theory but I have pieced it together from sources that I do not remember… I do know that the mint experimented with different “washes” during the minting of the state quarters and some of them actually turned a very dark color. PCGS has slabbed some of these and identified them as such, though I have never seen one slabbed as experimental wash that was frosty. Of course after seeing your coin I could be totally wrong, but it is just a guess.
The ones I've seen (a total of four) were altered outside the mint by a process similar to sandblasting.
