Introduction. During the Cuban Missile Crisis, leaders of the U.S. and the Soviet Union engaged in a tense, 13-day political and military standoff in October 1962 over the installation of nuclear-armed Soviet missiles on Cuba, just 90 miles from U.S. shores.
Base Metal. Base metal is a jewelry industry term for nonprecious metals used in costume jewelry, including copper, aluminum, brass, nickel silver, pewter and white metal, also called pot metal. Nickel silver is a silvery-white alloy resembling silver made from nickel, zinc, copper, iron, manganese and sometimes lead.nlike fine jewelry, costume jewelry is made from nonprecious metals called base metals. Most of these are both beautiful and relatively benign. However, nickel can cause an allergic reaction, while the lead found in some alloys has been linked to far more serious conditions and is highly regulated.
Pure silver is usually too soft for jewellery meaning. that it will scratch easily. It is therefore alloyed. (mixed with other metals) to improve its durability. Sterling silver is the worldâs most popular silver. alloy. It consists of 92.5% silver and 7.5% other. metals (mainly copper). It is excellent for jewellery. because it preserves the colour, lustre and heft of. pure silver and vastly improves its durability.