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Hmm, terminology at play here. The Arkansas stone is usually bound "harder" than the Coticule, but the abrasive in Coticules (garnet) is actually usually harder than that in Arkansas stones (silica)....

Yup, synthetic stones usually aren't used with slurry except perhaps the coarsest stones that you want to speed up - but then afterwards you still want to finish up the work on that stone with plain...