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Gold is a metallic yellow transition metal and belongs to the copper group, as does copper and other precious metals such as silver. In chemistry, these three metals are also referred to as “coin metals”. In addition to ritual use as jewelry or means of payment, gold is also used as an additive in food as E175. It is used in medicine, electronics, optics, decoration or as a food additive and still has the function of an investment and a currency. The consumption of gold in small amounts in food e.g. as a decoration is harmless, since it is insoluble in gastric acid and is excreted.