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Jinliufu today's quotation inquiry Jinliufu gold today's quotation how much is a gram

How much is the gold price of Jinliufu? One gram? Many people want to know the price of Jinliufu gold, so the following Xiaobian will help you sort out the quotation of Jinliufu gold and the method to distinguish the true and false of Jinliufu gold. Let's get to know each other

Jinliufu gold quotation

How to distinguish the true and false gold of Jinliufu?

1. Look at the color

According to the different luster and color of gold, we can roughly distinguish pure gold, K gold, real gold and fake gold. That is, red yellow (yellow red) is the best gold, with a fineness of more than 95%; The positive yellow color is about 80%; The fineness of cyan and yellow is about 70%; Yellow is slightly gray, and the fineness is about 50%. Therefore, the formula is' seven green and eight yellow, nine five red, yellow and white, gray and half gold '. For jewelry that has been hidden for a long time, there is a saying that 'copper turns green, silver turns black, and gold never changes color'.

2. Weigh

Gold is about twice as heavy as silver, lead and tin of the same volume. Real gold has a falling feel when held in the hand, while copper or others have only a heavy feeling without a falling feeling.

3. Listen to the sound

When gold jewelry with high fineness is knocked or thrown to the hard ground, it will make a dull and low sound of 'pop, pop', with sound, no rhyme and no elasticity. K gold has rhyme, sound and elasticity. The greater the elasticity and the sharper the rhyme, the worse the fineness. Fake or low quality gold has a crisp but no dull sound. It generally makes a 'Dangdang' sound, and the sound has a residual sound. It beats violently after landing.

4. Flexural hardness

High quality gold can leave traces when carved with pins or nails. More than 97% of the finely colored gold jewelry, after being bent two or three times, wrinkles appear at the bend, also known as fish scale lines; About 95% of the gold jewelry with good quality feels hard when bending, and the fish scale pattern is not obvious; About 90% of the gold jewelry is of good quality. It is very hard when bending and has no fish scale pattern; Gold jewelry with more impurities can break after bending two or three times; If it is made of raw gold, the bend is broken, and the section has obvious sand shape. When using this method, we should consider the width and thickness of jewelry. The thick and wide ones are harder, and the thin and narrow ones are softer.

5. Color identification with touchstone

Use the gold pair (the gold medal with determined fineness) and the tested jewelry to grind on the touchstone, and determine the fineness of gold jewelry by comparing the colors. This method should be carried out under natural light and fluorescent lamp, not under direct sunlight and incandescent lamp.

In the past, people often used the touchstone to determine the general content of gold. The touchstone is a mixed black mineral such as quartz and opal containing carbon. If you draw a stripe on the touchstone, you can see the general color of gold. Pure gold: shiny dark yellow and thick yellow; Silver containing gold: light to green; Gold containing more than 25% silver: earthy white; Copper containing gold: the color is deepened and red; Gold containing silver and copper: yellow; Gold containing zinc, copper and nickel: white gold.

6. Acid point

Grind the gold path of the identified jewelry and the matching card on the touchstone respectively, and test the nitric acid on the gold path with a glass rod. Because the chemical properties of the gold element are stable and do not react with acid, the color remains unchanged. If it is not gold or pure gold, the golden path disappears or changes. The change law is' three fast and three slow ', that is, the low quality disappears quickly and the high quality disappears slowly; Mixed gold disappears quickly and clear gold disappears slowly; The big mixed gold disappears quickly and the small mixed gold disappears slowly. Depending on the disappearance of the golden path, the quality of gold jewelry can be determined by comparing the right cards.

7. Burn with fire

Burn the jewelry to be identified with fire (do not melt and deform the jewelry), and observe the color change after cooling. If the surface is still the original gold color, it is pure gold; If the color darkens or darkens to varying degrees, it is not pure gold. Generally, the lower the color, the thicker the color, and all turn black, indicating that it is a fake gold jewelry. When it is really red, it is quenched into water and its color remains unchanged. True does not change color in case of fire, false does not fire-resistant, turns black purple, not bright.

In an experiment, two pieces of gold with different purity, one containing a small amount of impurities and the other is wanzujin, were melted with a professional welding gun, and the melted gold showed a completely different state. The gold necklace with low purity has dark color, rough section, and the place with solder is obviously blackened; Wanzujin is still as bright as new gold, and the melting surface is smooth and clean, even brighter than before.