I've had good success using LSD...just kidding, never did psychedelics.
Why a premium...because some people will pay.
Actually most vinegars are 5% acetic acid. Pickling vinegar I have seen at 7%, but the usual white stuff is 5%.
I would guess a limit of 50 and $8000 since I have no idea of what you are talking about.
Since I don't notice any significant notching at the corners where I would expect to see it, and the doubling appears kind of flat, I would...
Pretty much anything you use to alter the surface of a coin lessens it's numismatic value. That being said, if you uncover a key date or variety,...
Actually a mixture of baking soda and washing soda is the recommended treatment. (Sodium Bicarbonate and Sodium Carbonate for you chemists out there)
Do you have guns in the house? :)
Separate names with a comma.
