My husband purchased several "un-searched" wheat penny rolls off of Ebay as gifts for me this year. While going through them we found 4 in one roll that have a rainbow tone. The seller didn't mention anything about them in the auction. My internet research lead me here, so I would like to ask you smart folks what you think. Is this natural & if so, are they worth anything more than a regular wheat penny in extra fine condition? All 4 are similar, so I just posted pictures of one.