he ivory trader had to know his ivory, which varies from hard to soft. On the whole, the ivory of East Africa is of the soft variety. The dividing line between soft and hard is the Congo border; west of this line it is hard, to the east it is soft, although there are variations within each region. Buyers maintained that soft ivory came from areas where water was scarce; for example coastal ivory from near Pangani and Mombasa was never as good as that from the dry, upland regions of the interior. Soft ivory is white, opaque, and smooth, it is gently curved, and easily worked, and has what might be called 'spring'. Hard ivory, on the other hand, is translucent, glossy and of a heavier specific gravity than soft ivory; it is more subject to extremes of temperature and more difficult to carve.