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Would oven cleaner work well for other types of natural stones? i.e. thuringian stones?

It's definitely not a natural combination stone, but didn't the old coticules have the BBW glued as the backing instead of the slate they use now? I have a coticule with a BBW backing, but it's...

Seeing as it's an old stone, maybe it isn't a slate backing on the coticule, but a belgian blue. I would try to give the bottom a light lapping to see. If the slurry is purplish blue, it's not slate...

Looks kind of like a pinkish coticule. I'm very interested to see how it cleans up. Be sure to post pics after all the grime is cleaned off!