Sharpening stone identification

Question

Can anyone tell me if this is a oil sharpening stone or water sharpening stone? It was my grandfathers, and I would like to put an action, but not sure exactly how. Any help would be appreciated, thank you!!

aghast · Answer

Simple answer: put some water on it.
If you have an old oil stone, then it probably still has some oil buried in the nooks and crannies. If you put water on it, some of that oil will probably lift off and make the water "oily". You'll see various artifacts of water and oil - a film, a rainbow sheen, drops suspended in the water, etc.
If it's a water stone, well, you'll get nothing except maybe metal particles.

Sharpening stone identification

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