Hexagonal Clock by Lurasco Freres, Amsterdam
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A 19th century hexagonal clock, signed Lurasco Freres, Amsterdam. Oak-cased, alabaster face with porcelain Roman numerals and gilded ormolu mounts, two-train French drum movement striking on one gong, height 52 cm, width 51 cm, depth 13.5 cm. Provenance: Collection of Catherine Hannah, former president of the New Zealand Antique Dealers Association and noted antique dealer in Rotorua for over 40 years.
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- Ormolu - Ormolu was popular with French craftsmen in the 18th and 19th century for ornamental fittings for furniture, clocks and other decorative items. True ormolu is gilt bronze, that is bronze that has been coated with gold using a mercury amalgam. Due to the health risks associated with using mercury, this method of creating ormolu was discontinued in France in the 1830s. A substitute was developed consisting of about 75% copper and 25% zinc, however it was inferior to the bronze version. It was often lacquered to prevent it tarnishing.
- Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
- Alabaster - Alabaster is soft natural stone used for statuary, with a similar appearance to marble, but easier to work with. As it is softer than marble, an item made from alabaster can be scratched with a metal object, and an alabaster item does not polish to a high surface gloss like marble.
Alabaster objects can be semi-translucent. Alabaster occurs in a pure white form and also with veining from dirt. Colours vary from white through yellow and pink to brown. The veining is usually green or black but can be multicoloured.
Being semi-translucent, alabaster is often used for the bowls of figural lamps, with the figure itself being either alabaster or marble. - Gilding - Gilding is a method of ornamentation whereby a thin sheet of gold metal is applied to items made of wood, leather, ceramics, glass and silver for decorative purposes.
For furniture including mirrors, the sheet of gold is usually applied over a coating of gesso. Gesso is a mixture of plaster of Paris and gypsum mixed with water and then applied to the carved wooden frames of mirrors and picture frames as a base for applying the gold leaf. After numerous coats of gesso have been applied, allowed to dry and then sanded a coat of "bole", a usually red coloured mixture of clay and glue is brushed on and allowed to dry, after which the gold leaf is applied. Over time parts of the gilding will rub off so the base colour can be seen. In water gilding, this was generally a blue colour, while in oil gilding, the under layer was often yellow. In Victorian times, gilders frequently used red as a pigment beneath the gold leaf.
Metal was often gilded by a process known as fire gilding. Gold mixed with mercury was applied and heated, causing the mercury to evaporate, the long-term effect of which was to kill or disable the craftsman or woman from mercury poisoning. The pursuit of beauty has claimed many victims, not the least of which were the artists who made those pieces so highly sought after today.
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