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Great! Thanks for posting that as it confirms the figures I'd posted earlier.

Wonder what stones Naniwa uses green carbide in besides the green lobster 120 grit?

good idea... I've seen a lot of lists that don't jive too. especially with micro-abrasive powders (lapidary places generally list diamond powder by mesh but is that the same thing as grit? Doesn't...

Yeah, that does explain a lot but some makers seem to grade tigther than the specifications which is nice... Shapton seems fairly consistant an Naniwa even more so, at least in their Snow White 8k...

Oh, no problem. There were just some questions about the validity of your JIS numbers and it was obvious they came from my second grit page so thought I'd better explain where I originally got...

Cool, you've been digging too! I presume you've seen Verhoeven's paper on knife sharpening with the scanning electron micrographs of waterstone edges and the effects of stropping? ...

I'll second that! micron size alone will only get you in a rough ball park. For example; a surgical arkansas stone is made of daitoms which range from about 5 to 10 microns but they are bonded so...

Hi, it appears that Olivia took the jis tables from one of my pages... I can't give you a reference for the data to proove its accuracy, but I spent about a year with a kanji dictionary and...