By Bourgeat-Lami E.
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Extra resources for Organic/Inorganic Nanocomposite Colloids
It was made by vulcanising rubber, that is to say by heating rubber with sulphur. It could be m d d e d and mass produced and was therefore much cheaper than jet. It was totally opaque and oolour was added to make it a deep black. The colwr faded with age and today most pieces display a greenib-brom hue (Fig. 3). They have dso lost their high polish. Under magnifmtion tiny spots of wying colour may be seen, a~ am a slightly pitted surface (Fii. 6). Vulcmite did not split when worked so items of j d e r y could be screwed together (Fig.
It was used to make picture frames (Fig. 13. l), dressing table sets, some j d e r y and, notably, 78 rpm gramophone records. Bxamined under a microscope it is possible to see the wood content. Black shellac gives a black streak. Celluloid was one of the early plastics that was used in numerous ways. It was made of cellulose nimte and was -ely combustible, but a saCer version, cellulose acemte, was later developed. Dyed black, they are reasonable imimtions of jet but hey have a plasticy look and feel.
34 Pieces of rough and polished g a l . Top, left and middle: South Americm copd; right: New Zedand kauri; bottom right, Dominican copal. 35 Detail of c o p f d c e , showing deterioration and ' d m . 32 GEMS AND ORNAMKNTAL ~~ OF ORGANIC ORIGIN Figure 136 Copal seeping on & of Kauri w e . New zedand huri The most famous of copals, the so-called kauri gum, is h m the Ag& australis (Fii. 36). Examples of this tree can still be seen today in a couple of the national forests in North Island, New Zealand.