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You can lap an ark flat in about 15-20 minutes with loose Silicone Carbide. $15 will buy you a progression from 60-500 grit and enough to do several stones, from Gotgrit.com.

60 grit and a dollar...

I once watched a guy remove a deep scratch, from a plate glass window, he used a progression of wet and dry sanding disc on a Makita random orbit, palm sander. He went up to 3k, then Cerium paste, he...

What’s the worst that could happen?

If you don’t like the way it performs, just lap it on a sheet of 1k wet and dry and burnish to your liking.

Cool, please report on the finish it produces.

Also, can you explain the process, what grits did you use and maybe the how to.

Nice looking old stone. Cutting edge… as usual.

There are blacks with white streaks and translucent with black streaks and some, grey almost translucent stones.

They are very close and many say, the same in performance.

The white lines on...