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Question for Bart: could these circled areas be quartz inclusions?
This is my 8x3, "La Petite Blanche" layer. Fast cutter, smooth edges! So far, I'm getting great edges with it--my test shave today w/ a super-fussy 9/16 extra-hollow razor was just about the nicest I've had from that blade. No pasting either!:) This makes me think they may not be quartz--wouldn't they make it impossible to get a good edge if they were?
It's hard to see in the photo, but they almost looks kind of translucent. Could just be an illusion, though. I ran my fingernail lightly across the top & they "seemed" harder, but that's a pretty unscientific test and I didn't want to have to do lots of lapping afterward. The stone gives "jittering" feedback when an edge has maxed out (at least I think that's the reason; it doesn't do it if I've just put the blade on the hone, only after I've done some strokes)--that's how I know when to back off the pressure while honing. And again, the edges I've put on razors with this thing have been amazing... Nothing to worry about or should I be concerned?
Thanks to Bart, for your info here and on coticule.be! :beer2:
EDIT: the circled areas are showing up too small when viewed initially--crappy digital camera is the problem