1. Liu Fu jinjin 999 is a kind of pure gold with a gold content of 99.9%, which belongs to high-quality gold with a red and yellow appearance.
In fact, there is no gold with 100% purity. 999 gold is the most valuable jewelry in the market, and it is usually processed by solderless welding technology.
2. Liu Fu Jin Jing 999 belongs to pure gold, and Jin Jing 999 refers to gold with a gold content of 99.9%.
Theoretically, the gold content of pure gold is 100%, but due to the influence of gold purification process, gold with gold content above 99.6% will actually be called pure gold.
Pure gold 999 is a kind of gold with high purity. Its appearance is red and yellow, and its texture is very soft, so it can be marked on the surface with nails. Moreover, after bending several times, the bent part will have obvious fish scales, which are not available in low-quality gold.
The purity of 9999 gold is higher than that of 9999 gold, which is the highest value of jewelry color in market circulation. Usually, it is made by "solderless welding process", with consistent overall quality, dark red and yellow color, very soft texture and easy deformation.
How to identify the authenticity of Jinliufu gold and silver jewelry;
1. Measure the density of gold and silver jewelry with physical knowledge to identify the authenticity of gold and silver jewelry.
The method is as follows:
1. Put the jewelry with the density to be measured into a measuring cylinder filled with 200ml aqueous solution, and the number of milliliters that the liquid level rises, that is, the volume of jewelry boiling water, is also the volume of jewelry. Here we assume that the volume of jewelry is V cubic centimeters. (Note 1 ml = 1 cm3).
2. Weigh the quality of jewelry with a balance. Put the jewelry in the left plate of the balance, and put an appropriate amount of weight in the right plate of the balance, and adjust the whole travel code to balance the balance. The quality of jewelry is the weight plus the grams represented by the travel code. Here we might as well assume that the quality of jewelry is m grams.
The density of this jewelry is m/v, calculate the specific value. The real gold weight of one cubic centimeter19.3g, and the real silver weight of one cubic centimeter10.5g.. You can see the truth by comparison.
Second, identify the authenticity of gold and silver jewelry by burning.
1. "Real gold is not afraid of fire." Put the gold jewelry in the fire and burn it red. After cooling, if the jewelry surface is still golden yellow, it is real gold. If it turns black, it is fake gold.
2. The silver of real silver jewelry will not change after burning, but it will turn black if the fineness of silver is low.
Third, use chemical knowledge to identify the authenticity of gold and silver jewelry.
1. gold jewelry, take 1: 3 nitric acid and put it on the object for half a minute. If it bubbles, wipe it with absorbent cotton or white paper. If it is blue-green, it must be imitation of copper or copper alloy; If it does not react with nitric acid and does not develop color, it is generally a genuine product with toughness and hardness.
2. Silver jewelry, or take a drop of 1: 3 nitric acid and put it on the object. After half a minute, put it in light salt water. If it is white and turbid, it is also considered genuine.