Hippopotamus ivory - One source indicates the grain is closer and denser than elephant ivory and a a pure white with a texture that has been described as between elephant ivory and pearl shell. Another source describes it as having no grain pattern and being very homogeneous. There are apparently characteristics in larger pieces of this ivory that may allow precise identification as hippopotamus. Walrus ivory - often used for sword handles in it's original form. Scrimshawed by sailors of old.
Color is a yellowish cream.
Prehistoric Walrus ivory is seen in the current marketplace. There are apparently characteristics in larger pieces of this ivory that may allow precise identification as walrus. Most of these will have lines that are too straight, too even, and will continue down the ends and on the other side with no variation. Bone has tiny little channels where the blood vessels and nerves resided. Corozo nut and also the doum-palm nut.