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Is the coti in question a pink la Dressante? I have one that looks very similar that's a very fast stone. The faster stones can be tricky to use, especially to finish on

+1 for the DiaFlat. It eats trans arks and les lat hybrids.
It's also good for conditioning stones like your washita. I keep the bottom of my washita freshly lapped off the DiaFlat to keep it...