Quote Originally Posted by Lemur View Post
Well, you can hone on brass, I've cut and fasetted precious stones on brass, copper, aluminium and tin, all you need as something on them like diamond, SiC, tinoxid or the like, you add it as paste or powder and there is hones that are concave for honing razor blades. But these look strange to me, hopefully we can get some more info on them.
Surely, the things warranted a special case and seem to be highly valued. Is one brass and one bronze, I wonder?