I inherited a few dark gray sharpening stones from my uncle (finish carpenter) and grandpa (black smith) and I'm ignorant how to tell if they are... oil stones or wet stones (water).
These are probably the hardware store or Norton abrasives.
So..
Use oil or water or does it matter?
Or is it... use oil for industrial stuff and use water for kitchen & food prep stuff?
And dont intermix water or oil use?
They are run of the mill cheap stones that almost certainly were used with oil and just as probably with water and dry.
If the stones are fairly clean and flat they are probably useful. Most are not, at least for decent knives anyway.
