O.K. I was sanding some Sodalite on the red 600 grit soft disc
and got a silverish discoloration on it. I can only assume it's the silver
color from the sharpie color I used on the rock to be a guide to not
missing any spots or flats, etc...
It's odd because I used the sharpie to color the stone on the 325 grit
soft disc and no discoloration al all.
I think the disc is O.K. as it's just color. Right?
James