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Nice natural coticule ! I don't have a clue what the orange one is but as much use as it had it looks like it would be awfully good for something. Knives or maybe tool blades ? Maybe even razors ?...

If the back side of the coticule produces a purplish slurry then it is a BBW back whether glued or naturally formed. Nice stone. I wouldn't know about the other one but Howard at the Perfect Edge...