Pure elemental gold is 24 karats, while 18-karat gold is 75 percent pure gold, 14-karat gold is 58.5 percent pure gold, and 10-karat gold is 41.7 percent pure gold.Gold metal flakes may be eaten in foods or drinks, although it is a common allergen for some. Although gold is a heavy, dense metal, it is generally considered nontoxic.Very thin sheets of gold may appear greenish blue because gold strongly reflects red and yellow. A sheet of gold can be made thin enough to be transparent. A single ounce of gold can be beaten into a 300-square-foot sheet. Malleability is a measure of how easily a material can be hammered into thin sheets.Gold threads can even be used in embroidery. A single ounce of gold (about 28 grams) can be stretched into a gold thread 5 miles (8 kilometers) long. The element symbol for gold-Au-comes from the old Latin name for gold, aurum, which means "shining dawn" or "glow of sunrise." The word gold comes from the Germanic languages, originating from the Proto-Germanic gulþ and Proto-Indo-European ghel, meaning "yellow/green." The pure element has been known since ancient times.Nearly all the gold on Earth came from meteorites that bombarded the planet over 200 million years after it formed.Gold is the only metal that is yellow or "golden." Other metals may develop a yellowish color, but only after they have oxidized or reacted with other chemicals.
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