Ivory Black is made from burned bones. It used to be made from actual burned ivory. The genuine pigment is still made in tiny quantities from Ivory harvested from animals that have died naturally.
Genuine Venetian Red comes from the quarry where Titian obtained his supplies!
And if you really want to be old fashioned, Terra Rosa (genuine), is made from natural iron oxide clays from Europe or the Middle East. This is the stuff cave painters were using 30,000 years ago!