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Ok, a happy surprise, after a quick degreasing, and lapping on a 140 plate, it is not a Thüringen, but pretty sure it a, super hard, Charnley Forrest.

Had a little dip in the middle but lapped...

I almost always have a half dozen stone soaking, under the sink. I keep 3 jars, with different levels of cleanliness.

Picked up this 6 inch Yellow Green Thüringen yesterday. It popped out of the...

That looks like an oil soaked Lilly White Ark. I soaked one in Simple Green for almost 6 months, to get it to release all the oil and back to white. Changing the solution every couple weeks.

Yup. The first one looks like a medium grit India stone, the second a oily Translucent, should be a finisher.

Lap with 60 grit lose grit Silicone Carbide, flat then work up in grit. GotGrit.com...