Gold, as a precious metal. I think everyone should be very familiar with it. Whether it is in a TV series or in a normal life, it is always inevitable.
When you get married, you may want to buy some gold jewelry. There are also a lot of investment in buying and selling gold. Today, Xiaobian is here to tell you some knowledge that you may not know about gold.
gold
First: Gold is not 100% pure. 24K gold is often considered to be pure gold. In fact, its gold content is only 99.99%.
Second: The steam emitted when gold is melted is green. During the smelting process, its gold powder is often brown.
Third: Gold's ductility is very strong. One ounce of gold can be pulled into 50 miles, so gold is the strongest in metal.
Fourth: Gold forgeability is second to none, which can cause very thin gold pieces. The ancients often used gold as a thin piece to decorate the building.
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Fifth: Gold, as a precious metal, has good physical properties. As the saying goes, "True gold is not afraid of fire" means that gold does not melt easily under normal flames.
Sixth: Gold is a very soft metal. It can be traced with nails on pure gold. This is also a way to judge whether it is pure gold.
Seventh: Gold itself will not rust, but the chemical affinity of goldfish sulphide is very strong, it is easy to adsorb the hydrogen sulfide acid gas in the air, resulting in a dark color such as orange, brown red and other colors are possible.
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