Sure. Put it under a microscope with a calibrated reticle and measure
it, then compare the size of the grains to one of the abrasive industry
More practicle for home use might be to try working some mild steel and
see what sort of finish it gives compared to your other stones.
The fact that I sand 80-100-120-150-180 is really only a convenience.
The essential information is "start coarse, end fine."
So long as you have a handle on how it compares to your other stones,
that's all you need to know.
Thank you for the advice. I bought a few of these stones from estate sales
and it is easy to tell an oilstone or waterstone by traces of oil. How do you
compare "coarse" and "fine" when you have no reference? I estimate the stones
maybe 1000 grits or above from ex-woodworkers' basement and one of the oilstone
is red color "Norton".
Anymore suggestion? Thanks again.
Sharp is sharp. Grab a 4x glass and keep checking things out. I go
from 220 for reshaping (unless they are a *disaster*) to 600 to 1000,
1500 and then 2000 on microabrasive paper. After the 220ing it goes
600 gives you a wierd sort of grayish mirror, the 1000, 1500 and 2k
really bring out the luster of my burnt umber nose-hairs.
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