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rn成为第2008位粉丝rn可参考如下方法进行鉴别：rn1、看色泽rn根据黄金的不同光泽和颜色即可大体区分纯金、K金，真金、 Fake gold. That is, gold is better yellow (yellow -red), and the color is more than 95%; the positive yellow color is about 80%; the blue and yellow color is about 70%; the yellow color is slightly gray and the color is about 50%. Therefore, there is a formula for "seven green eight yellow, yellow nine five red, yellow leucorrhea ash pairs of gold". For jewelry from Jiu Tibet, there will be a saying that "copper turns green, silver turns black, and gold will never change color".
2, 量 weight
D gold weight is about double the same volume of silver, lead, and tin. True gold has a feeling of falling on the hand, while copper or others only have a sense of heavyness without falling.
3, listening to the sound
When the high -quality gold jewelry is knocked out or threw it hard, the dull and low sound of "click, click", there is no rhyme or elasticity, and K gold has sound charm. , Sound, elasticity, the greater the elasticity, the more the rhyme, the more the elderly, the worse the color. The fake or low golden sound is crispy but no dullness. Generally, the sound of "Dangdang" is emitted, and there are surplus sounds.
4, folding hardness
has a high color gold, and traces can be left with large head needles or nails. More than 97%of gold jewelry, after twisting two or three times, wrinkles appear at the bending, also called fish scales; about 95%of gold jewelry, it feels hard when bending, and the fish scales are not obvious; about 90%of the golden gold golden gold; The jewelry is very hard when the bending is bent, without fish scales; gold jewelry containing more impurities, bend twice or three times to break; if it is made for raw gold, the bend is broken. When using this method, the width and thickness of the jewelry should be considered. The thick and width should be hardened, and the thin and narrow ones are softer.
5. Use the test goldstone to identify the color
The use of the gold -pairing card (the gold medal identified as a color) and the subject's first jewelry on the test gold stone to determine the color of the gold jewelry through the contrast color. This method should be carried out under natural light and sunlight, and cannot be carried out under the direct sunlight and incandescent lamps.
This in the past often used testing gold stones to determine the general content of gold. Testing gold stones are a mixed black mineral such as quartz and protein -containing quartz, and the gold is drawn on the test stone to see the general shape of the gold. Pure gold: shiny dark yellow, thick yellow; silver gold: light color change slightly green green; gold containing silver greater than 25%of gold: earth white; copper -containing gold: deeper color, red color tone; silver copper tone; Gold: yellow; gold containing zinc, same, nickel: white gold.
6. Use acid dot
The golden roads that have been identified and paired on the testing stone, respectively, and test the nitric acid on the golden road with a glass stick. Therefore, the color is unchanged. If it is not gold or non -pure gold, the Golden Road disappears or changes. The law of changes is "three fast, three slows", that is, the low color disappears quickly, and the high color disappears slowly; Depending on the disappearance of its golden road, compare cards can determine the color of gold jewelry.
7. Burning with fire
This will be used to burn red (do not melt the jewelry) with fire (do not melt the jewelry), and observe the color change after cooling. During different degrees, it 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. After burning red, it is quenched into the water, and the color remains unchanged. It really does not change color when it comes to fire.
The tests, two golds with different purifications, one containing a small amount of impurities, and one is a full -scale gold, which uses professional welding guns to boil, and the gold after burning is completely different. The color of the gold necklace with a low purity becomes darker, the section is rough, and the location of the welding medicine is obviously dark; and the golden foot gold still shows the bright golden nature of the gold, the melting surface is smooth and clean, and even brighter than the original.

wholesale sterling silver animal jewelry The gold shop has a fake. It depends on the reputation of the store. There is no 100 %. It is a certain content. The gold jewelry is easy to participate in fakes, so it is best to choose a well -known brand because it is difficult for us to identify purity. Because gold belongs to valuable metal items, it is recommended to choose carefully when buying.