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Are very versatile. You can use them with just water (no need to soak them just wet them on the surface). They can also be used with a slurry. Rubbing a piece of coticule stone on the surface of...

might be a Coticule. Very nice stone for honing razors. The restore guys will want more detailed shots of the razors before going to far with advice. It looks like one might be a frowning blade...