Silver and Tortoiseshell Collection by William Simpson
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A collection of silver and tortoiseshell items, Viniagrette, 1830, Wiliam Simpson, including a sterling silver vinaigrette, a shield shape niello pill box, a silver box, a tortoiseshell thimble, a photo locket, a tortoiseshell box and a travel clock, height 9 cm, width 7 cm, (clock)
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- Niello - A compound made up of lead silver copper and sulphur that is black in colour, and applied to the engraved areas of silver items, thus highlighting the engraving by making the black niello detail stand out from the silver background. It was used on edged weapons from the Renaisance onwards, and also by Russian crafstmen of the19th century.
- Sterling Silver - Sterling silver is a mixture of 92.5% pure silver and 7.5% of another metal, usually copper. Fine silver is 99.9% pure silver, and is relatively soft and the addition of the very small amount of copper gives the metal enough strength and hardness to be worked into jewellery, decorative and household objects.
- Tortoiseshell - Tortoiseshell is a translucent material that comes from the horny carapace of a certain types of turtles, including the hawksbill turtle. It is often therefore mounted on a colour underground - often red - or inlaid with gold or silver thread, as seen in Boulle furniture.
The texture and colour nuances of the material are extremely important. Heated tortoiseshell can easily be formed into various shapes. Like other natural materials, tortoiseshell becomes more beautiful with use. In a time before plastic, tortoiseshell was widely used for small objects such as combs and powder compacts.
In 1973, the trade of tortoiseshell worldwide was banned under CITES (The Convention on International Trade in Endangered Species). Prior to importing or exporting items containing tortoiseshell a CITES permit must be obtained. Tortoiseshell items cannot be traded on Ebay.
"Faux tortoiseshell", another case of man initiating nature, is made from old-style plastics such as celluloid and cellulos and is coloured with red, yellow and brown spots to imitate the genuine article. It is commonly used in glasses frames, musical instruments and costume jewellery.
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