Collectors tip from one of our readersIt is fairly easy to discern ivory if you know what it does NOT look like.
Cast resin whale teeth or other cast resin pieces usually have tiny burst bubbles in them that leave small round depressions in the surface. Also, the cavity in the bottom of the tooth will not be deep and will not mirror the contour of the outside. Best test is to hold the item about 2 inches over a stove burner. As it heats up it gives off a noxious plastic odor.
Bone, which is organic, will normally show either a uniform blanched white surface or numerous tiny parallel lines. If you hold bone over a stove burner, as it heats up it will begin to smell like chicken bones left on a barbecue grill.
Ivory, regardless of the animal it comes from, normally has some apparent wavy grain like woodgrain that you can find someplace on the surface. If the object includes the entire round tusk, you can see crosshatching just inside the outer "skin". If held over a stove burner, it will give off the same smell as bone as it heats up.
On fake scrimshaw, the "engraving" and artificial scarring are the same shallow depth. A fake whale tooth generally also shows parallel saw marks across the bottom (open end).
Collectors tip from one of our readers--Dr. Jerome C. Ford from
http://www.iovinc.com/