ATM A 100% Sharpie Test?

[Dan Cassaro <dcass@mediaone.net>]

There have been a number of comments in the "Lapidary Grit" thread about
using a Sharpie to test for pits (ie draw lines in ink, and then grind
until the black pits disappear).
A crazy thought:  could one spray the entire surface of a fine ground
mirror, thus filling all the pits with ink, let dry, and then grind
until *all* the black pits were gone?  It would certainly make finding
pits much easier...
Has anyone tried this?
Dan