1. The bank is a state institution, so the gold bars sold by the bank are directly sold to the public. Therefore, the gold sold by banks is strictly influenced by the international gold price. International gold prices fell, but banks did not rise. But the gold shop is a private organization, and the price of gold will be determined according to the average market price. Generally, the price will be much higher than that of banks. Moreover, the gold price of a gold shop will not change with the international gold price immediately, and there will be a certain lag.
2. The manufacturing processes of the two are also different. The gold bars in banks are hardly processed. Add some zodiac signs to the gold bars at most, but the gold bars in gold shops are different. The appearance is more beautiful than that of the bank. In order to raise the price of gold, gold shops will make a fuss about these gold bars, whether it is patterns or zodiac, which is obviously much more vivid than banks, and the price will naturally go up.
1, physical and chemical properties of gold, physical properties, color: the steam emitted when gold melts is yellow-green; Its gold powder is usually brown when it is melted; If it is cast into thin slices, it can transmit green light. Ductility: unusually strong. 1 oz gold can be stretched to 50 miles long, and its ductility makes it easy to cast, making it a good choice for making jewelry. Of all metals, gold has the greatest pulling force. Extensibility: second to none. It will cause extremely thin gold sheets to roll up easily. Gold weighing 1 oz can be hammered down to 1 ft, 100 m2. The ancients hammered it into thin slices and spread it in temples and palaces for decoration. All these can explain the flexibility and ductility of gold.
2. The color of gold is golden yellow, which has metallic luster and is not easy to decompose. The density is 19.3g/cm3 and the melting point is1064.4℃; Good ductility, can be pressed into thin foil, and has extremely high heat and thermal conductivity. The resistance of pure gold is 2.4P Pure gold has good chemical resistance and is the best electroplating material. 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 be golden yellow after cooling. High density and heavy touch. Good toughness and ductility, good electrical conductivity. Pure gold is bright yellow, but the color changes greatly after mixing with other metals, such as gold-copper alloy is dark red, and silver-containing alloy is light yellow or grayish white. Gold is easily ground into powder, which is also the reason why gold is dispersed in nature. Pure gold jewelry is also easy to wear and lose weight.
3. In Mendeleev's periodic table, the atomic number of gold is 79, that is, the nucleus of gold contains 79 protons, which are positively charged. At the same time, gold has good chemical stability because it conforms to the half-full law. In the metal market, gold and ruthenium, rhodium, palladium, osmium, iridium, platinum and other metals are collectively called precious metals. Although gold is a very soft metal, it is not as good as lead and tin. Nails can be used to draw marks on pure gold, which makes gold very easy to process. But this is not ideal for the manufacturers of decorations, because it is easy to scratch the decorations, make them lose their luster and even affect their appearance. Therefore, when gold is used to make jewelry, copper and silver are usually added to improve its hardness. Gold is easy to forge and extend, and can be ground into transparent and green gold foil with a thickness of 0.001mm. 0.5g of gold can be drawn into160m long gold wire.