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There are many methods used to clean spyderco stones. Most commonly like you mentioned is an abrasive powder (many including myself prefer bar keepers friend) and a scouring pad. Works very well....

Thanks Randy! Yes I also heard the fine stone is just fired and left as is and the ultra fine is dressed with a diamond cupped wheel which gives it sort of a surface texture you can see but cannot...

They are one solid piece of fired ceramic. Very very hard. Shapton glass cut faster and at a quantified grit rating ie. 1000,4000,8000,16000 etc. I’ve had both and enjoyed using both.

I’ve been messing around lately with spyderco stones and specifically the Fine and Ultra Fine. I was a coticule guy for quite some time but after I found out how much keener a blade could get using...