Gem and Ornamental Materials of Organic Origin by Maggie Campbell Pedersen

By Maggie Campbell Pedersen

The fabrics lined within the publication comprise Amber and Copal; Jet; Ivory; Bone; Antler; Rhino horn; Horn; Tortoiseshell; Pearl; Shell; Coral, and different fabrics of plant and animal starting place which were used as gem or decorative fabric. The e-book describes the right way to realize them and the way to tell apart them from the fabrics most ordinarily used to mimic them, for instance plastic.A finished checklist of fabrics is integrated and every is gifted with information of its foundation, availability and conservation prestige, examples of, and a quick heritage of, their use. Organics healthy jointly due to their origins, simply because they're continuously used jointly, have related histories and have been the earliest gem fabrics used.200 colour photographs are incorporated for ease of reference and identity, permitting you to spot this fabric through sight, fending off the standard gemological exams which destroy them.Organics ensue in sleek and old jewellery, in ornamental goods and in a few furnishings, and this booklet attracts the entire details jointly to supply the 1st entire review of the subject.* a special reference publication comprehensively documenting natural fabrics* hugely illustrated colour stuffed booklet for ease of reference* examine the historical past and the way to spot natural fabric"

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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.

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