2. Slide the page to the bottom and click to see more;

3. Select and click on the gold you need to invest in;

4. After entering the gold details page, click the fixed investment, enter the fixed investment amount, and select the payment method and fixed investment cycle;

5. Click OK and enter the payment password.

Domestic testing standards for gold products are very strict, and regular merchants generally regulate the whole process from raw material procurement to storage, processing and sales. Investment gold bars sold by major domestic brands and channels can generally be repurchased. When buying back, it must be damaged and sprayed with a gun. Gold bars become "golden bumps" and then are detected by gold detection equipment. If there is a problem, you will know it as soon as you test it. Moreover, the production process of gold bars is actually relatively simple, and there will be no technical problems, but the process of gold jewelry is relatively complicated. A few enterprises may dispute the quality of gold on extremely delicate issues such as solder joints, but this is not a problem of adulteration, and consumers need not worry.

Operating environment: Apple 12, ios 14, Alipay version 10.2.3.

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1. As a precious metal, gold has good physical properties. "Real gold is not afraid of fire" means that gold has high chemical stability and is not easy to react with other substances, so there is no need to worry about oxidation and discoloration. Even in the molten state, it will not be oxidized and discolored, and it will still glow after cooling. High density and heavy feel. Good toughness and ductility, good electrical conductivity. Pure gold is bright yellow, but the color changes greatly after adding other metals. For example, the gold-copper alloy is dark red, and the silver-containing alloy is light yellow or grayish white.

Second, gold is easily ground into powder, which is also the reason why gold is scattered in nature. Pure gold jewelry is also easy to wear, reducing weight. In Mendeleev's periodic table, the atomic number of gold is 79, that is, the nucleus of gold contains 79 positively charged protons. At the same time, because it conforms to the half-full law, the accessories have good chemical stability. In the metal market, gold and metals such as ruthenium, rhodium, palladium, osmium, iridium and platinum are collectively called precious metals. Although gold is a very soft metal, it is not as good as lead and tin.

Third, pure gold can be marked with nails. This softness makes gold very easy to process. But this is not ideal for jewelry manufacturers, because it is easy to scratch jewelry, make it lose its luster, and even affect its appearance. Therefore, when gold is used to make jewelry, copper and silver should be added to improve its hardness. Gold is easy to forge and stretch. It can be ground into 0.00 1mm thick transparent green gold foil, and 0.5g gold can be drawn into 160m gold thread.