Thread: Got a box of 25 stones, need some ID help (cotis, and thuris, and Norton? Oh my!)

Originally Posted by Toroblanco

That is a wahita. Probably a hard/fine one. I have one that can do a light bevel set all the way to 7kish. Very wide range on some of those.
Use loose SIC on those to save your diamond plate. Washitas and Arks can eat up diamond plates. Even good ones! Just finish with the plate because Atoma flat is real! Lol!

I think you're right
That said....there's really not going to be much stone left if i fully lap it lol
We'll see, maybe if i get bored enough one day.
In the mean time, I'm already looking at another washita for sale online lol

Yea. Could be Washita, just lap the flat side, leave the concave side.

If it Washita you need some loose 60 grit Silicone Carbide, you will ruin a Diamond plate and sandpaper won’t do much.

Yup, would definitely do the less dished side, and definitely with the SIC powder

Amazing Find !

Pretty much the collection one could retire on.

Originally Posted by cman670

Pretty much the collection one could retire on.

Yeah, this pile could be the last stones i ever need to buy, but will they be?
That's a whole different question lol

I understand completely. I have quite a few nice stones (some here as well) and still look at these like I have none. I'm hopeless.

From what I've read, about your lapping, and the pics of the hone, I'd agree with a Washita of some type.

Will light penetrate the stone.? I have two of them, one is partially translucent, the other, not at all.

Originally Posted by outback

From what I've read, about your lapping, and the pics of the hone, I'd agree with a Washita of some type.

Will light penetrate the stone.? I have two of them, one is partially translucent, the other, not at all.

Interesting, thanks!
I hadn't come across anyone talking about translucency on those.
A 600 lumen flashlight held against the surface, immediately next to the edge, shines through the side for 1/4-1/2".
Just holding it up to natural light doesn't do anything

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No. 25 is probably a Frictionite 00. The "micro cracks" you referred to are caused by freezing and thawing or improper tempering during the manufacturing process.