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While it IS true that the burnish is what makes them a fine finisher as you said that's well documented. And nothing new, even outside razor circles. Norton ought to be as aware of it as we are.
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Well, my issue with The chart Jimmy's post references is the same I take with Norton's - it's got them organized according to the grit contained in the hone. But we're not honing with loose grit.
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If you look at the chart in that Norton catalogue, you'll find a lot of things aren't as they seem. Notice the hard Translucent Arkansas rated at 6 microns between the 4K and 8K? Think anyone would...

True enough. I just never cared enough to question - or even think about - the misinformation I was working with. Even if the yellow brick was '5K JIS equivalent' the shave off of it is good enough,...

Interesting. I thought Norton was either using the US grit scale or their own proprietary thing. Never would've guessed they were working off the JIS, but it makes sense considering their largest...