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I owned one that sounded like I was honing on sandpaper and when I was done the edge was chipped to pieces. No one could explain why, and this was an old coticule with a box that said it was for...

Wow, crazy, so many Cotis and non was good? I also tested a view and yes, not all of them I´ve tested are good finishers for straights. But I know there are really good ones out there.
When I saw...

Got this beauty (8x3") with extra bluish cast. It had grainy tendencies first but after a decent lapping it is absolutely smooth. The edges are excellent, I think it is my best Coti due to ease to...

The chips on the image (ca. 200x) are visible with the naked eye, but you need a very good eye. Be careful with sharp blades... :tameshigiri:
I think optimal is a magnification of 150x-200x. I'm...

...which is how it should be. My first Petas also produce very good edges. This one is different, here is a picture after finishing on the stone. On the right of the chipping you can see a decent...

Ok, hehe, you´re right, spessartins are orange-red. Here is a picture of a La Grise surface. Are this garnets?
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@Iceni - That are big garnets in your stone. My problem is different. I lapped my stone quite smooth, it is almost glassy now. I lapped it very long with w/d 400 and it helped. Then I used 800 and...

Here is a "soft" Les Petas, very good sharpening feeling, a bit grainy but nice.234056
This is a very hard Les Petas. I have a little problem with this stone. Normally, very small garnets dissolve...

I have made good experiences using a very hard stone like Llyn Idwal or Charnley Forest to rub the Les Petas smooth. Using a bit pressure does not harm. Still a bit grainy, but I get real good eges...