Black Light Picking Up Cleaning

Interesting. I will have to try this to a few of my coins to see how well it works and on what types of cleaning processes. It probably would not be a cheep bad investment to have a hand-held one if it works good.

amassey08873, a clean water rinse after dipping might remove much of the tell tale signs of dipping. Acetone in general removes organic compounds. The water rinse followed by an acetone rinse to erase signs of dipping is something I learned from a friend who owned a coin shop for many years. The dull surface that remains can never be removed, might tone over in time. Others here are far more knowledgeable on this subject than I (chemestry).

Broad spectrum UV light will often expose residue left over from a dipping.

Don't use nail polish remover. It contains a variety of other chemicals besides acetone and will leave nasty gunk on your coins. You can get good-quality pure acetone at Home Depot and other hardware stores.