If your coin has that black stuff on it that collets after awhile does it effect the grading?Also if you clean that stuff of with water and soap does that make it worse? NEWBIEhttp://www.cointalk.org/images/smilies/confused.gif
Yes and yes. The black stuff you mention could be just dirt and grime accumulated through normal circulation or it could be black toning. But trying to clean the coin with soap & water is always - always - a bad idea. Soap leaves a film (sticky) residue on coins that only tends to collect more dirt. It can also cause unsightly toning over time.
It would depend on the coin and its value. I would recommend searching previous posts about cleaning coins. When in doubt don't clean it. If you need to have it cleaned and are not experienced yourself - have it done professionally.
type in "cleaning coins" into the search bar, on this page, and you will get so many reasons not too clean a coin, and how many different things people have tried and failed at, so the fastest answer is no there is no way too get that off (safely, without doing something that cant be reversed too the coin) sorry but that's the way the cookie crumbles. John
