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09-09-2009, 02:13 AM #9
I believe as dave does the final two are combo coticles, The blue belgian(purple) ranges approx 4-6 k grit and the yellow approx 8-10. As the stones are a natural occurence there is no quality control these are only approximations and probably open to debate.
It is easier to fool people than to convince them they have been fooled. Twain
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ChayesFSS (09-09-2009)