Seven green, eight yellow, nine purple and ten red, seven green and eight yellow

I think gold 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.

How to identify ** jewelry.

1) Look at the mark: Now the best jewelry produced by Chinese manufacturers is purified and prepared according to international standards, and marked with k, using k to indicate the amount of gold in metal products. Pure gold is 24k, and the gold content reaches 99 6; 22k gold content is 91 3; The gold content of 20k is 83 3; The gold content of 18k is 74

7％；The gold content of 14k is 58 5; The gold content of 9k is 37 5％；The gold content of 8k is 33 3％；The gold content of 1k is:

According to the words 24K or 18K on the mark, you can know the fineness of the jewelry, but according to the regulations, it is not possible to mark K gold if it is less than 10K.

2) Look at the color: **The higher the purity of the jewelry, the darker the color. As people often say, "seven green, eight yellow, nine purple and ten red", that is, if the gold jewelry is blue-yellow, the gold content can reach 70; It is yellow, and the gold content can reach 80 90; If it is reddish yellow, the gold content can reach more than 95.

Of course, it is not enough to distinguish the color, authenticity and falsehood of ** jewelry by color.

3) Weight: The specific gravity of ** is higher than that of other metals. The weight of ** of the same volume is 1 8 times that of silver and times that of copper. Therefore, the real gold should feel heavy in the hand, and the fake ** should feel lighter.

4) Listen to the sound: throw the gold ornament to the table, or throw it on the hard ground, the lower the gold content, the greater the elasticity, the higher the jump, make a crisp sound, and there is an aftersound; The higher the gold content, the less elasticity, the lower the jump, and the sound produced is low, heavy, and there is no residual sound.

5) Test hardness: the higher the gold content of the jewelry, the softer, easy to bend by hand, good toughness, not easy to break, and clear scratches will be left when carved with hard things; The lower the gold content, the harder it is, it requires more force to bend, and it is easy to break, and the scratches are not obvious when carved with hard things.

6) Scientific testing: First, use the method of fire to identify. The jewelry is burned in a smokeless fire, and the color of the pure gold remains unchanged after burning; Darkened or blackened color is fake gold or insufficient fineness.

The second is the chemical method. Use sulfuric acid at a concentration of 45 or 70 to test, ** no change, keep the same; silver turns black; Copper bubbling green. Because metals such as silver and copper are soluble in acid, chemical reactions occur.

**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. Personally, I think it refers to the color at room temperature, and the non-gold part will have a chemical reaction when the temperature is very high in the molten state, and the color is uncertain.

And if you judge the purity of gold in this way, it is unlikely to look at the color in the molten state.

The interpretation of "Seven Green and Eight Yellow" refers to money in general. Yuan Wang Shifu The second fold of the first book of "The Legend of the West Chamber": "Measuring the poor and talented, the favor is only half a piece of paper, and there is nothing very green and yellow.

Wang Boliang said: "The "Gegu Yao" is called gold: 'seven green, eight yellow, nine purple, and ten red.

The third fold of Yuan Anonymous's "Bowang Yaotun": "He also has that grandfather, two mothers, three brothers, four brothers, five sons, six brothers, and seven green and eight yellow, nine purple and ten red sisters in his family. "The third and fourth chapters of "Han Qi Leisure Commentary":

He is a poor talent, and he is not very young. ”

Word decomposition Explanation of Seven Seven ī several names, six plus one (often capitalized "柒" on banknotes and documents). The stylistic name, or "Seven Bodies", is another form of futi. In the old days, after death, there was a sacrifice every seven days, a total of seven times, called "doing seven".

radical : a; Interpretation of yellow yellow á like gold or the color of a sunflower flower : yellow .

Twilight. Bezoar. Huang Chengcheng .

Confessional. Specifically refers to the Yellow River in China: Yellow Plague.

Cure yellow. Basal closed yellow floodplain. Refers to the "Yellow Emperor" (i.e. "Xuanyuan Clan", the legendary leader of the tribal alliance in the primitive society).

Huang Lao (Yellow Emperor and Lao Tzu). Descendants of Yan and Huang. Things are lost.

Refers to money . Idiom source: Yuan Limb Tsai Wang Shifu "The Hunger and Withering of the West Chamber" The second fold of the first book: "Measuring the poor talent and human affection is half a piece of paper, with nothing to be seven green and eight yellow, as long as you say, one is to be sown two." ”

Zhuyin: Idiom Grammar: Joint; as an object, a definite; Refers to money and feelings. Color: A neutral idiom.

Idiom structure: Joint idiom.

Year of generation: Ancient idiom.

English translation: wealth