Thanks Wishman.
Scrimshaw lends its self more to ivory ie teeth. The bone for this pen is more than likely from a bow head as they are the most commonly eaten whales here. Bow heads are baleegonous(sp?) whales, instead of teeth they have multiple plates of a hair like substance called Baleen. Baleen is a dark gray hard and flexible but only 1/4 inch thick. Only natives can work baleen and it dose take to scrimshaw but of a diferent type than you use to. Basically the lines of the drawing end up light and the back ground dark. A "whale bone corset" actually had baleen staves, not bone. Humpbacks and blue whales are in the same family as bow heads.
The teeth of odontocetes, toothed whales like Orca and sperm whales, were frequently used for scrimshaw.
Vertebra are to porous for scrimshaw, wow took the long way around that one eh!?!