Chemistry:Pinchbeck (alloy)
Pinchbeck is a form of brass, an alloy of copper and zinc mixed in proportions so that it closely resembles gold in appearance. It was invented in the early 18th century by Christopher Pinchbeck (died 1732), a London clock- and watch-maker.[1] Since gold was only sold in 18-carat quality at that time, the development of pinchbeck allowed ordinary people to buy gold 'effect' jewellery on a budget. The inventor allegedly made pinchbeck jewellery clearly labelled as such. Pinchbeck jewellery was used in places like stagecoaches where there was a risk of theft. The original Pinchbeck was made by Christopher Pinchbeck and his descendants until the 1830s.[1] Later dishonest jewellers passed pinchbeck off as gold; over the years the name came to mean a cheap and tawdry imitation of gold.[2] Today, depending on the dealer, "Pinchbeck" can mean original Pinchbeck or any gilt metal.[1]
Pinchbeck fell out of use in the second half of the 19th century, being replaced by low-carat gold which had been legalised in 1854.[3]
Pinchbeck is typically composed of copper and zinc in ratios of 89% copper to 11% zinc; or 93% copper to 7% zinc.[4]
See also
- Gilding metal
- Prince's metal
References
- ↑ 1.0 1.1 1.2 Tolkien, Tracy; Wilkinson, Henrietta (1997). A Collector's Guide to Costume Jewelry Key Styles and how to recognize them. Firefly Books. p. 33. ISBN 1552091562.
- ↑ "Pinchbeck". World Wide Words.
- ↑ Levine, Gilbert; Vookles, Laura L (1986). The Jeweler's Eye: Nineteenth-century Jewelry in the Collection of Nancy and Gilbert Levine. Hudson River Museum. p. 28.
- ↑ "Pinchbeck". Chemistry Learner.
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