Gold has always held a great fascination on people. Offerings and ornaments from sites around the world testify to the importance of the precious metal, which started to be mining and processing already in the Chalcolithic Age: The oldest find of worked gold comes from the Varna Necropolis and v to around 4500 BC dated... Other precious finds are the mask of Tutankhamen, the Sky Disc of Nebra and the Golden Hat of Schifferstadt. Always was gold symbol of the closeness to the gods, for immortality and untold wealth.
In the realm of the Incas, it was regarded as welding the sun, with the Egyptians as a symbol of the sun god Ra, and in Greek mythology, the Golden Fleece storied object of desire. Gold is considered indestructible and incorruptible - qualities that man also wanted to make his own always.
Gold is a pure "solid" metal in nature. With a share of around 4 mg / t in the solid earth crust, it is among the rarest elements of our living space. Because of its low hardness it can be machined mechanically, it is easy to alloy, does not corrode, and is therefore an excellent material. It is usually used in alloys with copper and silver. Depending on the desired color and texture, the proportion of Feingold (yellow gold) or copper (red gold) dominates. To the white or gray gold alloys decolorizing additives such as palladium, more recently also chromium or cobalt are added. In the rarely used green gold, on the other hand, copper is completely absent, and the proportion of Feingold in the total mass of the metal alloy determines the value. This fine content is measured in carats, abbreviated kt, which is not to be confused with ct (200 mg), the same weight unit for gemstones. With a gold content of 24 carats, approximately 24 of 24 weight parts are gold.
Approximately because all impurities can never be completely eliminated. One speaks of a gold content of 99.9% or - in the likewise usual metric system - of 999er gold. Usual gold alloys are 18 carat (750 gold), 14 carat (585 gold) or 8 carat (333 gold), which in some countries is no more than gold recognized. Often, the jewelery is marked by a brimstone impression, the punctuation which indicates the gold content according to the metric system. The majority of the gold won is processed into jewelery. However, the precious metal is also used in the industry (eg for electronic circuit boards or optical coatings) and dentistry, or it is used for barrents and gold coins.
To this day, coins such as the South African krager edge, the Canadian Maple Leaf or the American Eagle have a legendary attraction on collectors. Gold is an important part of the currency reserves of many countries and is regarded as a crisis-proof, stable investment. Everything gold that has ever been brought to light on the earth is still present in any form - a rarely constant quantity on our planet.