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
Magnesium alloy with a manganese-dioxide cathode. Magnesium-lithium alloys are generally soft and ductile, and the density of 1.4 g/cm is appealing for space applications. Quantum mechanical simulations have been used to predict the formation of ordered magnesium-lithium alloys. Of interest relative to manufacturing, it is predicted that addition of more than 13 at. % lithium results in ordered-phases with a cubic structure. Adding 2% of calcium by weight to magnesium alloy AM60 results in the non-combustible magnesium alloy AMCa602. The higher oxidation reactivity of calcium causes a coat of calcium oxide to form before magnesium ignites. The ignition temperature of the alloy