Anything non porous would do! I looked up jasper to see if it's any higher in SG, but it is also just sub 3.0 (not surprising, I guess).
Maybe some lead ingots. I think lead SG is 11 or 12 :)
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Somewhere, someone is sitting with a pile of large stolen coticules cursing the fact that the edge they're getting isn't as keen as they'd like.
I know about uranium mine where in about 300 metres bellow is layer of rock verry simmilar to Thuri.
suehiro markets stones that they call "chemical stones", and it's implied in some catalogs that there is some physical and chemical cutting going on at the same time.
These uranium stones could be called "atomic hones".
It's so funny the way some conversations segue, lol.
Please!!!
We've been warned about humour on this thread.
Actually, I don't recall a warning, only an opinion. I agree with the general sentiment but don't agree that anyone has made light of what has happened. I believe that most of us who have dealt with Ardennes Coticule have a great deal of respect for them and levity in this thread does nothing to diminish that.