Identifying grit of a hone
Hi,
I've inherited a sharpening stone from my grandfather. It's obviously quite old, and has no identifiable markings on it, other than the words GClarke stamped into the wood base (maybe the owner, I'm not sure). I believe my grandfather used to sharpen his filleting knives on it.
It looks like a very dark blue/green piece of marble, and is about the size and shape of my norton 4k/8k. It's attached firmly into a piece of wood.
When I run my fingers over it, it feels like a piece of marble, but with the faintest grit.
I was wondering if there is some test or someone I could take it to who would be able to identify the grit?
regards,