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<p>[QUOTE=&quot;2manybooks, post: 2719141, member: 8267&quot;][USER=4654]@808 raver[/USER] -</p><p>The examples you have shown are of thin slices of ivory cut along the length of the tusk, exposing tangential surfaces, highly polished. These are the least likely to show visible schreger lines. Have you examined the edges of these pieces under magnification? Schreger lines are most visible on surfaces that would be cross sections of the original tusk - in your pieces this would be on the edges of the panels. The phenomenon is not restricted to modern ivory. Schreger lines are visible on mammoth ivory as well. In fact the difference in the angles of intersection can be used to distinguish ancient mammoth ivory from more recent elephant ivory. All modern species of elephant, African and Asian, demonstrate schreger lines.</p><p><br /></p><p>As I noted, absence of <i>readily visible</i> schreger lines does not prove an object is not ivory, but their presence is indicative of elephant ivory. The examples I chose to post were selected to illustrate the phenomenon for those just learning to identify them.</p><p><br /></p><p>Here is an article on &quot;IDENTIFICATION AND DIFFERENTIATION OF THE ASIAN</p><p>ELEPHANT IVORY BY USING SCHREGER LINES&quot; -</p><p><a href="https://www.researchgate.net/publication/318504983_IDENTIFICATION_AND_DIFFERENTIATION_OF_THE_ASIAN_ELEPHANT_IVORY_BY_USING_SCHREGER_LINES" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.researchgate.net/publication/318504983_IDENTIFICATION_AND_DIFFERENTIATION_OF_THE_ASIAN_ELEPHANT_IVORY_BY_USING_SCHREGER_LINES" rel="nofollow">https://www.researchgate.net/publication/318504983_IDENTIFICATION_AND_DIFFERENTIATION_OF_THE_ASIAN_ELEPHANT_IVORY_BY_USING_SCHREGER_LINES</a></p><p><br /></p><p>21 tusks of Asian elephants were studied. The conclusion was that: &quot;The</p><p>Schreger lines were present in all studied samples. Thus, it is concluded that the presence of Schreger line is the identifying feature of an elephant tusk.&quot;[/QUOTE]</p><p><br /></p>

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