Posted 12/22/2008 3:26 pm
Simple. Soak those coins in gum remover. 
However, don't forget to purchase only Black Gum Remover. 
As already noted you left out way to much info.
Without photos try explaining some of the following:
1. What type of coins are you discussing?
2. What does that black gum really look like?
3. Are these valuable coins?
4. Where did you find, buy or steal those coins?
5. What dates are on the coins?
A gummy substance could be almost anything and taking it off may or may not distroy the coin.
However, don't forget to purchase only Black Gum Remover. As already noted you left out way to much info.
Without photos try explaining some of the following:
1. What type of coins are you discussing?
2. What does that black gum really look like?
3. Are these valuable coins?
4. Where did you find, buy or steal those coins?
5. What dates are on the coins?
A gummy substance could be almost anything and taking it off may or may not distroy the coin.
