1. I agree with nahgobbi completely. If your planning on selling those, that's different. If your keeping them, then by all means, leave them alone and you have something to remember someone by.
2. Do not use backing soda and water. Backing soda is abrasive and you would probably use tap water which could contain anything found on Earth.
3. Acetone is available at almost any store that sells paints such as
Walmart,
Kmart, Ace Hardware, Home Depot, etc. This is considered a comercial grade though and not ment for delicate procedures. If you do use it do this first. Place some on a very clean, clear glass dish. Allow to evaporate. If there is any residue, stuff left over, discard or just don't use on coins. It is contaminated. How? Acetone is a great absorber of many things including the inner lining of that can. In canning companies cans are coated on the inside as well as decorated on the outside. The inner coatings are exceptionally absorbant resistant. Resistant does not mean CAN NOT. It means should not and occationally does absorb some of that coating pending on how long that can sat on the shelf.
4. If you do use Acetone, do a search on this forum for Acetone usages.
I'd still leave well enough alone.
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Posted 02/08/2008 4:00 pm
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with my MIL, not coins, I'm afraid. 
