Pinchbeck (alloy) it came to mean a cheap and tawdry imitation of gold. Pinchbeck is typically composed of copper and zinc in ratios of 89% copper to 11% zinc; or 93% copper to 7% zinc. 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 18th century by Christopher Pinchbeck, a London clockmaker. 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
Prince Rupert of the Rhine one part of zinc, combined with charcoal; this became known as "Prince's metal" in his honour—sometimes also referred to as "Bristol Brass". Rupert invented the alloy in order to improve naval artillery, but it also became used as a replacement for gold in decorations. Rupert was also credited with having devised an exceptional method for tempering kirby fish hooks, and for casting objects into an appearance of perspective. He also invented an improved method for manufacturing shot of varying sizes in 1663, that was later retained by the scientist Robert Hooke, one of Rupert's Royal Society friends during the period.