> Am 13.02.2011 04:22, schrieb Alain:
>
>> You may try the values for some bone or bone like materials. Ivory is
>> after all a kind of bone.
>
> Not really. Unless you call teeth a kind of bone, too.

In fact, teeth and bone are essentialy the same base material: calcium 
carmonates.
The enamel covering a teeth is much harder and tranparent, but the 
dentine under that is relatively close to bone and tend toward yellow-beige.

Usualy, ivory tend to be somewhat yellower than bone, even beige, 
especialy after several years.
Ivory can get a beter polish due to a generaly higher density.



Alain

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