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Just a quick note on CrO.

The average particle size (e.g. 0.5um) does not fully describe the grit or scratching characteristics of CrO, which is definitely not the same as diamond at 0.5um.
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I get a HHT 0,1 off my finishing stone (Naniwa 12K). That is with a few, very light stropping finishing strokes. I have even shaved with it at this level and it was OK, but not great. The CrO on...