Gold is also used in infrared shielding, colored-glass production, gold leafing, and tooth restoration. Gold’s high malleability, ductility, resistance to corrosion and most other chemical reactions, and conductivity of electricity have led to its continued use in corrosion resistant electrical connectors in all types of computerized devices (its chief industrial use). 18- and 9-carat gold alloys are commonly used because they are more durable. 24-carat is pure gold, but it is very soft. The term ‘carat’ indicates the amount of gold present in an alloy. Craftsmen learned that alloying gold with other metals such as copper, silver, and platinum would increase its durability. Pure gold is too soft to stand up to the stresses applied to many jewelry items. About 75% of all gold produced is used in the jewelry industry. Gold is used extensively in jewellery, either in its pure form or as an alloy.
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