Date: August 2008
In your article about cleaning coins, you say to soak in
bleach solution. Is this straight bleach or mixed with water?
Start with a mixture of bleach and water -- 1/4 bleach, 3/4 water.
Try it. If your results aren't OK, than add a little more bleach.
Keep adding bleach until you're satisfied.
If after all this work, you still not satisfied, rinse the coins thoroughly
in water. Then place them in a cup with a little vinegar and salt. See if
that mixture helps.
What is not said here may be important. If this in reference to coin collecting,
most coins will be devalued if cleaned in all but specifically proscribed methods,
and sometimes not even under those conditions. Discuss this with a coin dealer if
you are dealing with rare coins.
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Update: June 2012