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<p>[QUOTE=&quot;2manybooks, post: 2612016, member: 8267&quot;]<b><font size="4">&quot;Examination using ultraviolet (UV) light</font></b></p><p>Examining an object thought to be ivory using ultraviolet light may help determine whether the material is ivory or made from another material. Using long wave ultraviolet light, materials will fluoresce different colors or absorb the UV light helping to characterize it.</p><p><br /></p><p>All ivory fluoresces under UV light and appears bluish-white (<a href="https://www.conservation-wiki.com/wiki/Ivory#ref2" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.conservation-wiki.com/wiki/Ivory#ref2" rel="nofollow">Hornbeck 2010</a>). Bone and shell have a similar fluorescence to that of ivory. Vegetable ivory will appear slightly orange or warmer in tone. Plastics will absorb UV light and appear dull blue (<a href="https://www.conservation-wiki.com/wiki/Ivory#ref1" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.conservation-wiki.com/wiki/Ivory#ref1" rel="nofollow">Espinoza and Mann 1992</a>).</p><p><img src="https://www.conservation-wiki.com/w/images/thumb/7/73/Ivory_uv.jpg/800px-Ivory_uv.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>Samples of ivory, bone and ivory substitutes under longwave ultraviolet light(365nm). From left to right: mammoth ivory, bone, tagua nut (vegetable ivory), and celluloid.&quot;</p><p><a href="https://www.conservation-wiki.com/wiki/Ivory#Identification" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.conservation-wiki.com/wiki/Ivory#Identification" rel="nofollow">https://www.conservation-wiki.com/wiki/Ivory#Identification</a></p><p><br /></p><p><br /></p><p>UV fluorescence will help distinguish ivory from plastic, but not necessarily from bone.[/QUOTE]</p><p><br /></p>

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