Just picked this stone up today. The thing was completely covered in thick black goo(still has some oil in it).It is 7"x2". Got it lapped and it turned out to be a light grey hone. Lapped very easily and is rather soft. Slurries easily as well. I'm guessing that the slurry is whitish but it is hard to tell with oil still being in the stone. It's also very smooth. Any guesses?
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Attachment 99819