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Message:: [QUOTE="GDJMSP, post: 732199, member: 112"]It's pretty easy to do yourself and not expensive. But it does take some time. First, go to the hardware store and get yourself some pure acetone. depending on the size of your collection, you might need a couple quarts. And a couple gallons of distilled water. Then get 3 clean glass dishes, shallow bowls will work. Put 1/4" or so of acetone in 3 of the bowls. Place a coin in the first bowl, let it soak for a couple hours. Then remove it and place it in the second bowl, 15 minutes should do. Then place it in the 3rd bowl, 10 seconds will work here. Then rinse the coin thoroughly with the distilled water, holding the coin only by the edges and moving your fingers at least once to rinse the area covered by your fingers the first time. Then stand the coin on soft towel, on edge against the counter backsplash or something and let it air dry. When dry, put it in your new holder. Do the same thing with every coin. Now, remember this - do not re-use the acetone. Once used pour it in a bucket or something. DO NOT pour it down the sink drain as it can disolve some plumbing (plastic pipes). Then take the bucket of used stuff to a paint store, some will take it and some won't. Call around. And make sure to do this in a well ventilated area, acetone evaporates quickly and the fumes are explosive. And they can make you quite dizzy. And - I would not use acetone on any copper coin. Send those to NCS.[/QUOTE]