One; Gold is a simple form of chemical element gold (Au), which is a soft, golden yellow and corrosion-resistant precious metal. Gold is a rarer, more precious and more valuable metal. Generally speaking, the gold in the world is in ounces. In ancient China, gold was measured in ounces, which was a very important metal. It is not only a special currency for reserve and investment, but also an important material for jewelry industry, electronics industry, modern communication and aerospace industry.
Second; The chemical symbol of gold is Au, and the financial English code is XAU or gold. The name Au comes from a story of Aurora, the goddess of dawn in Roman mythology, which means shining dawn.
Third; Gold will not be corroded and discolored by sulfur and oxygen at a simple high temperature, but it will be oxidized under certain conditions, or it will react very slowly with oxygen under pressure at a high temperature of 4,000 degrees with a catalyst. It can be considered as non-reactive, because in general, few flames can exceed 3,500 degrees, and gold melts above 1000 degrees, so it is generally believed that real gold is not afraid of fire refining, that is, gold does not react with oxygen at a high temperature.
Fourth; Although gold itself has not been corroded, it has a strong chemical affinity with sulfide, and it is easy to adsorb hydrogen sulfide acid gas in the air, and its surface may be dark, such as orange and brownish red. The production of gold products needs to go through many complicated processes.
Five; Take gold bars and coins for example. They all go through the processes of smelting, tabletting, blank cutting, blank pressing, quenching, acid frying, polishing, pressing and edge pressing. The working environment cannot be a vacuum environment. Every link may encounter dust and impurities in the air attached to the blank of the product. These impurities may become erythema after being stored for a period of time without quenching and pickling.
First of all, gold investment is mainly divided into physical gold, gold T+D, paper gold, spot gold, international spot gold (commonly known as London gold), futures gold, gold advance payment and people's livelihood gold, which are eight popular forms of gold investment.
Six; Physical gold, buying and selling gold in kind by buying and selling gold bars and ornaments. Physical gold: in the form of 1: 1, that is, no matter how much gold is purchased in any currency, it can preserve its value, and it can only buy up, but not down, with a large amount of investment and complicated procedures and expenses. It's hard to tell true from false.