Despite what some may say, the small diamond dusted tips are an easy way for beginners to completely ruin a coin and for expert forgers to unscrupulously tool details into a coin. I am not, however, completely averse to using a dremel tool to clean ancient coins. Using a soft brass bristle brush on a low RPM should not damage a coin with a stable patina. This is a safe way to remove dirt and encrustations from your coin. The bristles are soft enough that they will wear down rather than damaging the patina. Put hard tips on your dremel and, in my experience, you're looking for trouble.
Danny
Practice makes perfect... So I did a LOT of practice on slugs .... ( and
still managed to bugger up a few coins along the way!! ) But I do find that some of the grinding
tools, when used with a steady hand, are very useful for grinding down those bubbly
red encrustations that I find from time to time, ( usually over spots of BD.. ) and also for getting through the hardest layers of mineral encrustations, such as can be found on those Green/Blue
Ptolemaic coins that are floating around at the moment....
But one has to be careful......