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What is it? What should I do with it?
I picked this up today at an antique store. Its very hard and very smooth. It has a large crack in the middle but I think I could still use it if I stayed to one end. Just wanted to have you guys try and identify what kind you think it is. After lapping for 10 min. on 400 w/d, its barely touching it. The minimal amount of slurry coming off of it appears to be a white/gray color. Ill probably have to go to a coarser grit to start. Any info would really help.
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What is it? What should I do with it?
I have to agree I am thinking surgical black.
Which means its going to be a pain in ... to lap. Personally I used a palm sander with a 80 grit wet dry and worked up to 800 grit. I then took an old busted razor I got in a lot deal and rub that all over to stone with oil on the stone. Till it was completely covered in slag. Then clean off. Repeat. After that the stone should have a smooth surface that should have a bit of a shine.