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I didn't even know that exists. Isn't a sharpie considered a felt tip though?

I just tried using a felt tip, and it came off the stone right when I put it onto the wet sandpaper. I'm going to try a sharpie tomorrow and see how that works.

I'm trying to lap a mystery hone I found in my garage, and I'm having trouble seeing the pencil marks on the dark, wet surface. I was thinking about using a white colored pencil, but colored pencils...