How to look at gold, how to distinguish gold

I don't know if you're talking about the physical product or the spot.

One is physical identification, and the other is electronic disk ** analysis.

Take a look **There are too many variety.

Ah, the general trend cannot be denied.

To identify, here are some ways to do it briefly:

1. Look at the color: **The higher the purity of the jewelry, the darker the color. In the absence of a gold medal, the general fineness can be determined according to the following colors (based on lapis and gold.

The so-called lapis gold is only contained); The color of dark red yellow is above 95, light red yellow is 90--95, light yellow is 80--85, blue-yellow is 65-70, and the color blue with white light is only 50--60.

2. Weight: The specific gravity of ** is 19 32, which is heavier than silver, copper, lead, zinc, aluminum and other metals. Like the volume of **heavier than ** more than 40, heavier than copper 1 2 times, heavier than aluminum 6 1 times.

**Jewelry should have a sense of sinking in the hand, and fake gold jewelry feels light. This method does not apply to ** jewelry inlaid with gemstones.

3. Look at the hardness: pure gold is soft, low hardness, shallow marks can be scratched with nails, teeth can leave tooth marks, ** jewelry with high fineness is softer than low fineness, the more copper content, the harder it is, and the bending method can also test the hardness, pure gold is soft and easy to bend, and the lower the purity, the less easy it is to bend.

4. Listen to the sound: If the real gold with a fineness of more than 99 is thrown on the hard ground, it will make a horn sound, and there is no rhyme or elasticity. Fake or low-color** sound is brittle and no dullness, generally makes a "dangdang" sound, and the sound has an aftersound, and beats violently after landing.

5. Burn with fire: burn the jewelry to be identified with fire (do not melt and deform the jewelry), observe the color change after cooling, if the surface is still the original ** color is pure gold; If the color is darkened or darkened to varying degrees, it is not pure gold. Generally, the lower the fineness, the stronger the color, and all of them turn black, indicating that it is fake gold jewelry.

6. Look at the mark: domestic ** jewelry is purified and prepared according to international standards, and marked with a killing mark, such as "24k" marked with "foot red" or "pure gold"; 18K gold, marked with the word "18k", the fineness is lower than LOK, according to the regulations, you can't play K gold stamp.

1. Whether there are white bright spots. Cut the gold bar or gold jewelry with material scissors, observe its cut surface with a magnifying glass, if you see white bright spots, because ** and iridium cannot be fused together, it means that the ** is mixed with iridium.

2. Measure the specific gravity. Measure the weight of a pure gold bar with a balance, then place the bar in a measuring cup and pour water over the bar. Then put the gold bar to be tested into the measuring cup, observe whether the scale of the water rises or falls, as long as it changes, it means that the gold bar is not pure gold.

However, this method does not apply to gold jewelry, because there is air in it.

3. Real gold is not afraid of fire. Put the gold bars or gold jewelry on the fire for a while and observe the changes. Because iridium will oxidize with oxygen in the air, gold bars of insufficient purity will turn gray; Pure gold, on the other hand, will be red and shiny in color after being roasted by fire.

However, this method may be destructive to jewelry.

1. Look at the color and color: Many people know that according to the color of the **, it can be divided into pure gold, K gold, real gold, fake gold, etc. Generally, pure yellow with a fineness of more than 95% can be called pure gold; If the color of positive yellow is about 80%, it is called real gold; The yellow fineness is called K gold at about 70%; Yellow with a slight gray color, about 50%, can be called fake gold.

Therefore, there is a mantra for "seven green, eight yellow, nine five red, yellow and white with gray and half gold". For long-term ** jewelry, there is a saying that "copper turns green, silver turns black, and gold never changes color".

2. Look at the weight: ** It 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 other only has a heavy feeling and no falling feeling.

3. Listen to the sound: Generally, the real ** will make a dull low sound of "poof, poof" when throwing it up, with sound without rhyme and without elasticity, K gold has rhyme, sound, elasticity, the greater the elasticity, the sharper the rhyme, the older the color. The sound of the fake ** is generally a "dangdang" sound, and the sound has an aftersound, and it beats violently after landing.

4. Folding hardness: the real pure ** with sharp things is imprinted, if you want to bend it is not easy to break, and fake or low color ** is easy to break.

Hello,....Look at the color. The color of ** with high gold content is reddish gold, 80% of the gold content is yellow, and 70% of the gold content is green, and the gold content can be judged according to the color; 2.

Look at the weight. **It is about twice as heavy as silver, lead and tin of the same volume, and real gold has a feeling of falling in the hand while copper or other only has a heavy feeling and no sense of falling; 3.Listen to the sound, when the high-quality ** jewelry is knocked or thrown hard, there is no rhyme, the sound is dull, and the other metals are brittle and have no dull feeling.

Jewelry: Generally, large-scale ** jewelry monopoly will correspond to a number for each jewelry, and they dare not fake it in this case. The penalties are very severe, and you can rest assured.

**It is seven green, eight yellow, nine purple and ten red. It means that the gold content of blue-yellow is 70, the gold content of yellow is 80, the gold content of purple-yellow is 90, and the gold content of reddish yellow is almost 100. (2) Look at the specific gravity.

** is the largest specific gravity of any known substance, with a specific gravity of the same weight of brass; The volume of red copper is much larger than the same weight of **, red gold. Experienced people, look at the color, weigh the weight, you will know a thing or two. (3) It can be compared with the hardness, burned by fire, and identified by acid dissolution, red gold has the smallest hardness, can bite out marks with teeth, and can draw lines with a pin, real gold is not afraid of fire, burned in the flame, still golden, and other metals are oxidized and discolored as soon as they are burned.

Real gold is not soluble in a single acid (e.g., hydrochloric acid, sulfuric acid), and no other metal is comparable to gold.

If there is a pawn shop, it is most convenient to go there, and there may not be anything in the bank to identify **, and no one is so sure with your eyes, and the traditional methods of identification are now invalid Because now the fake ** cannot be distinguished 100% without instruments or chemicals.