What The!? Discoleration

[DigItUp]

I dug up a coin the other day and it had a rainbow looking coler on it any idea what this is and how to get it off

 

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[MUD(S.W.A.T)]

Do you have a picture?

A rainbow toned silver coin is usally valuable.

HH!!

 

[JakePhelps]

Leave the rainbow is what i would do, it is usually called "toning" and can make a coin much more valuble, especially if its rainbow like u say. And what ype of coin is it? Do you have a pic?