Australian Coin Grading.

question , when I put them in it , how long do I leave them in it and when I get them out , what do I do with them ? do I just wash with water or do I use a cloth of some thing and whipe them dry ..? ,, kel ,,

The problem with acetone is that it does dry quick. If the acetone has pulled anything off the coin (or pulled any oils off your fingers), whatever it pulled off will be left behind on the coin after the acetone dries. So after an acetone bath, rinse them either in fresh acetone or distilled/deionized water - not tap water. Fresh acetone is preferred, but expensive. If you use water, you'll need to dry the coins in as gentle-yet-thorough a manner as possible. When I wash coins in water, I usually put them on tissue paper and place them in a very cool oven (60 deg C or so) to dry for a half-hour.