Will it really turn black with gold?

Really gold will not turn black with fire.
Gold (GOLD) is a single form of chemical element gold (chemical element symbol AU). It is a soft, golden, corrosive precious metal. As a precious metal, gold has good physical characteristics, has high chemical stability, is not easy to chemically react with other substances, and do not have to worry about oxidation and discoloration. Even in the melting state, it will not be oxidized and discolored.
The saying that "real gold is not afraid of fire", it is said that after the gold is burned, it is still glittering and will not change color.

The extension information:
The tips for distinguishing gold purity:
1, listening. If you throw thousands of feet on the cement floor, a dull sound will be made, and there is no rhyme, commonly known as "dead sound". The sound of low or adulteration gold products will have rhymes, and the sound is sharp, and there will be signs of recovery.
2, baked. As the saying goes, real gold is not afraid of fire. Put the gold bars on the fire for a while to observe the color changes. If it contains 铱 or tungsten, the color of the gold bar will become gray, and after the pure gold is grilled, the color will be red.
3, look at the section. Cut the gold bars or gold jewelry with ingredients, and then observe the cut surface with a magnifying glass. If you see a white highlight, it means that the gold is mixed with a cricket. The diagonal cut is generally used, otherwise the hidden ends or in the middle may not be visible.
4, measured the proportion. Take a pure gold bars with the same weight as the measured gold bar, put the pure gold bar into a measuring cup, and flood the water bars in water; then put the detected gold bars into a measuring cup to observe the scale of the water. The gold bars are not pure gold.
Reference materials:
Baidu Encyclopedia -Gold (precious metal)

China News Network — n

Pay content for time limit to check for freenAfter answering 18K gold, it will turn black after being burned by fire, because this gold contains only 75 % of the golden ingredients, and the rest are precious metals, which will turn black after heating. Generally speaking, after 18K golden fire, it may not necessarily turn black, but there is also a possibility of turning black. This kind of gold is still more popular in the market. Because plasticity is relatively high, it is also very capable, so it is more favored. The jewelry of 18K gold is yellow or white. This gold is usually called platinum. This gold will be identified in the necklace. 75%of 18K precious metals are gold, of which 25%are other metals, and can be metals such as copper, aluminum, silver, cobalt, cashmere, iron, cadmium, nickel. If a piece of 18K gold jewelry is made of gold and copper melting, then the copper burns inside will generate copper oxide and turn black. Pay attention to wearing 18K gold jewelry. Do not contact chemicals because it is easy to cause fading. When the 18K gold is cleaned, it can be gently wiped with a soft cloth. Do not use the hand -washing solution containing chemical ingredients. This can avoid contacting many items, and it is not easy to be polluted by dust and oil stains.nAsk me to help me see that the middle two are burned with firenOne is liquefied gas burning and the other is a lighter burningnWhat to answernQuestion to see if this is K goldnIntersectionnAnswer I can only help you see because I am not a professional jewelry identificationnAsk, then you teach me what to think aboutnAnswer 1. Look at the necklace color. Now the material of the K gold necklace is generally not K or silver. K gold can be seen as gray with the naked eye. The overall is relatively hard. On the surface, silver is white, and the texture is more delicate and moist, but the hardness of the silver is lower than that of K gold, so it is easy to deform. So if you buy the K gold necklace is easy to deform, be careful to make silver.签2. Look at the necklace tags really 18K gold necklaces printed with steel prints with product labels, such as G18K, 18K or 750. If there is no label necklace, it is likely to be fake K gold. Pay attention to the K gold necklace purchased carefully. 3. Seeing the necklace process K gold is relatively hard, so many designers are the first choice for special jewelry. The jewelry process is very delicate and exquisite, and the style is very beautiful. However With no light, you can see the unintentional place at the neck link buckle with the naked eye.nAfter the real K gold is burned, the color will not change, and the color of the fake gold surface will gradually deepen until it turns black. Secondly, after the real K gold is burned, there will be no deformation, and the fake gold will deform to varying degrees. In addition, when the real K gold is burned, the ductility is still the same, and the texture of the fake gold will become crispy and easy to break.nMore 10nBleak

Hello, I will give you a simple way to distinguish the authenticity of gold and false on the Internet. Here are only some identification methods.

(1) See color: the higher the purity of the gold jewelry, the deeper the color. If there is no gold medal, you can determine the general color according to the following color (based on green gold. The so-called green gold contains only silver ingredients in gold); dark red yellow color is more than 95 %, light red yellow 90-95 % The pale yellow is 80-85 %, the cyan is 65-70 %, and the white light is only 50--60 % white light. The slightly yellow and white are less than 50 %. Generally, Qiqing, Eight Huang, and Jiu Chi can be used as a reference.
(2) Type weight: The proportion of gold is 19.32, which is more important than metal such as silver, copper, lead, zinc, aluminum. The volume of gold is more than 40 % heavier than the silver, 1.2 times heavier than copper, and 6.1 times heavier than aluminum. The gold jewelry should have a feeling of sinking in the hand, and the fake gold jewelry feels lightly. This method is not suitable for gold jewelry inlaid.

(3) Look at the hardness: pure gold is soft and low. It can draw light marks with nails. Teeth bite can leave tooth prints. High -colored gold jewelry is low and soft, with copper with copper, contains copper containing copper, contains copper containing copper The harder, the harder, the bending method can also test the hardness, the pure gold is soft, it is easy to bend, the lower the purity, the less likely to bend.

(4) Listening to the sound: Real gold with a color of more than 99 % throwing it on the hard ground, it will make a tap sound, there is no rhyme or elasticity. The fake or low golden sound is crispy but no dullness. Generally, the sound of "Dangdang" is emitted, and there are surplus sounds.

(5) Burning with fire: The jewelry will be burned red (do not melt the jewelry) with fire (do not melt the jewelry), and observe the color change after cooling. Dark or different degrees of darkness is not pure gold. Generally, the lower the color, the stronger the color, and the darkens are all, indicating that it is a fake gold jewelry.

(6) Seeing the mark: Domestic gold jewelry is allicized and prepared according to international standards, and the killing records, such as "24K" indicate "foot red" or "foot gold"; The word "18K" is marked, and those who have a lower color are lower than LOK. At present, illegal elements are commonly used to manufacture fake cards and imitation stamps in the society. They use rare gold, Asian gold, and even brass to impersonate real gold. Therefore, the identification of gold jewelry must be comprehensively determined according to the sample to determine the true and false and the quality of the real.