Conservator Le Crayon a Gratter Precision Pencil Set - 3 Brass Tips, 1 Brass Scalpel (No Pencil)

This set includes 3 sharp points for the most precise cleaning possible, as well as a scalpel to remove the hardest concretions. Each of the brass cleaning tips slide easily into our multi-pen Precision Pencils.

Although our brass tips are super-sharp, they take only a few minutes to master, and soon you'll be cleaning your coins like a professional.

For instance - 

The large Roman coin see in the photo has medium to very hard dirt on the surface with an under-lying perfect and sound green patina. 

Using our brass tips judiciously and not bearing down on the surface, we applied them to coin when it was wet and dry.  And, of course, always using tiny circular motions throughout. Our total time on this issue was only 15-minutes or so. Just a few hours or more, using these tools, will bring it to full glory!  

But, please remember, to not apply too much pressure on the tip in order to avoid damaging the coin or relics!