David Weaver
...surface quality on very thin shavings suffers a little bit. You can see tiny lines even when the sharpness his high enough to get a shaving half a thousandth thick.

Those lines don't show up on a carbon steel iron for obvious reasons.

I have no idea what size the particles are before heat treatment (3 microns, 5 microns?). If they're around that, they'd be 1 to 2 ten thousandths of an inch.

I don't think we'd see them. So I'm not sure what we're seeing on those irons. Separate post with diamond pictures - which as suspected creates tiny uniform scratches.