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You are right not determined, for what its worth, the scratch pattern looks about as refined as a 16k to me. My only attempt to use it a s finisher provided a nice edge and I did not spend a lot of...

Many people are raving about 12k
Super Stone.
12k Chinese natural is very slow, I can't compare to 12k Superstone finish because I never owned the Super Stone.
Then there are other natural stone...