Well...I received my stone today, took it out of the box, un-wrapped it and thought "oh no!!"
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Decent size stone but look at those darn streaks. They are not cracks but a fine layer of alternate material. I figured at least I know where to cut it to make some rub stones but decided to give it a try. Maybe those lines are not toxic.
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Broke out a Dovo that has been giving me problems, put down a slurry with an old DMT, and got to work. The stone had great feedback and no hesitation or skips along the cracks. Looked at the bevel under a loupe and didn't notice any unusual wear. Finished up with straight water and experienced a little chipping. I then stropped it with cro ox, linen, leather, and then back to the stone. Finished it with some lite circles and X strokes. Re-stropped and it gave a decent shave.
I next broke out my Boker and took it through a normal progression starting off with a slurry.
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3 sets of heavy to light circles and then about 20 laps of X strokes.
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I then diluted down to straight water and then finished up under running water. This razor was tree topping and hair was popping. Took it to the strop, no cro ox, just linen to leather and took off my goatee with very little effort. This razor has never been this sharp. The real test will be a 3 pass shave but I am extremely happy with this stone so far.