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I would hold off on using the oven cleaner on that Shapton!
Howard was referring to Arkansas and Carborundum stones. They are very different from a Shapton. You might dissolve the binding in the...

That looks like a natural Belgian stone. Good catch!:)
The dark side is about 4000 grit but is very slow cutting. I would use a 4000 Norton instead or any other medium grit stone.
The Belgians are...