How to tell the difference between gold and brass, how to tell the difference between brass and gold

Looking at the weight, brass is lighter, ** heavier; Looking at the color, brass is never as bright as the yellow.

The method of distinguishing brass and ** is: fire method, look at the imprint, listen to the sound, look at the hardness, and use sulfuric acid.

1. Fire burning method

The first method is to burn the copper ring with fire, and the copper ring will turn black, while ** will not change color. However, the temperature of our usual lighter is not reached, you can try to use the fire of the gas stove and burn it for a few minutes, and you can also see it. However, this method is not suitable for the identification of K gold, that is, 18K gold.

2. Look at the imprint

The second method can be seen from the jewelry imprint, **necklace imprint on the M buckle, bracelet and ring imprint on the inside, if it is**, it will identify a thousand pure gold, or pure gold 999, 18K, or AU750If the jewelry is copper gold-plated, some are not marked, and some monogram English GK, which means gold-plated.

3. Listen to the sound

The third method is to throw it on the ground and listen to the sound, this Qi Yin method Xiao Zheng once filmed a special issue of ** explained, the sound of copper has an echo, and the sound is brittle. The sound of gold was silent, and the sound was muffled and crackling.

4. Look at the hardness

The fourth method is to look at the hardness, the hardness of the ** is soft, such as the **ring, the ** can be pinched flat with a little force, but the copper is too hard to pinch.

5. Use sulfuric acid

The fifth method, with sulfuric acid, or nitric acid to soak identify, copper jewelry soaked with sulfuric acid for a long time, there will be a chemical reaction, the color will turn black, while gold will not. Copper jewellery will have a violent chemical reaction when it encounters nitric acid, but gold will not.

How to distinguish between brass and ** is as follows:

1. The imprints on the jewelry are different. **There will be color marks on the jewelry, such as: pure gold 990, 1000 pure gold 999.

2. Different colors. The color of pure gold or pure gold is a bright golden yellow, while the luster of copper is harsh.

3. The hardness is different. **The purer the harder, the lower the hardness, you can use your nails to scratch on the pure gold or pure gold, if there are small marks, and easy to bend, it is**; In the same way, no marks will be left on the brass.

4. The difference in quality of the same volume. The density is greater than brass, so the volume of the same weight is smaller than brass, put them in a cup filled with water, whoever discharges the water has a small mass, then he is**, and vice versa. In the same way, the same volume of ** and brass, the quality ** is greater than that of brass.

5. Will the surface turn black? Brass is more susceptible to oxidation than **, and a layer of oxide film is formed after the surface of brass is oxidized, so brass becomes black, and ** will not have such a problem.

6. The chemical properties are also different. Add two drops of micro-etching solution (sulfuric acid + hydrogen peroxide) to it, and the brass will soon produce blue copper sulfate, ** without any change.

**Buyer's Guide:

1. To choose a reputable brand enterprise, never be greedy for cheap and choose unbranded vendors, and the first is more transparent, significantly lower than the market to beware.

2. When buying first-class products, remember to ask for invoices, which is the core of protecting the rights and interests of consumers.

3. If in doubt, you can test in time, the ** jewelry testing institutions under the national technical supervision department are distributed in major cities, and it is relatively easy to detect the composition of ** jewelry.

4. Choose to invest in gold bars, gold bars and other first-class products, and choose regular merchants who promise to repurchase, and the quality can be guaranteed.