Putting it in some distilled water and picking at it with a toothpick will help.
Thank you for your prompt reply and advice,
Mat.
What I fear most is I may harm this coin...the
money I paid for this coin is not that much, I don't really need it back.
I really like this coin and want to own it, but I fear that the coin may get worse and worse because of me.
I may not be able to pay enough attention in treating this coin since I recently started an internship, and whats more important is that in my country, there are very few offline
shop who can get
help with this problem...
Maybe the seller who's more veteran than me can
handle this problem. I don't really want to harm the
history and beauty in this coin.
But while waiting for a reply from the seller, I should try the method you told me.