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79, making it one of the higher atomic number elements that occur naturally. Gold is resistant to most acids, though it does dissolve in aqua regia, a mixture of nitric acid and hydrochloric acid, which forms a soluble tetrachloroaurate anion. A total of 186,700 tonnes of gold exists above ground, as of 2015. 1 square meter, and an avoirdupois ounce into 300 square feet. Gold leaf can be beaten thin enough to become semi-transparent.
The transmitted light appears greenish blue, because gold strongly reflects yellow and red. Gold has a density of 19. 3, almost identical to that of tungsten at 19. Whereas most metals are gray or silvery white, gold is slightly reddish-yellow. Common colored gold alloys include the distinctive eighteen-karat rose gold created by the addition of copper. Alloys containing palladium or nickel are also important in commercial jewelry as these produce white gold alloys.