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so... would it be fair to say that you got ... "boned" ... when you were expecting ivory?

(sorry couldnt resist... :roflmao )

you're quite correct TBS, from memory the arrow head shaped marks should be quite acute (or pointy) on acient ivory and quite broard on new/illegal ivory

you can often tell by the "growth rings" in ivory
http://www.melfisher.org/aboutivory.htm

Also this page http://www.sloperama.com/mjfaq/ivory.html

Bone will not have any of these markings