How to identify golden hand ornaments?

Golden Sister.com helps you summarize the gold jewelry identification method, and more information can be visited to the website to check.
Gold jewelry refers to jewelry made of gold as the main raw material. The golden chemical symbol is AU, the gravity is 17.4, and the hardness of Mobi is 2.5. Gold jewelry can be divided into two categories: pure gold and gold. The gold content of pure gold jewelry is more than 99%, up to 99.99%. Therefore, there are "nine nine golds"/full gold "and" red gold ".
gold jewelry is a jewelry made of other metals (such as silver, copper) to the golden materials, also known as For "opening gold" and "golden gold". Due to the amount of other golden attractions, there are different K -kills of gold jewelry.
In gold jewelry, pure gold jewelry texture is softer, teeth, and teeth, and the teeth are relatively soft, the teeth are teeth, and the teeth are teeth. Bite the seal, it is easy to bend, the color is golden, pure, soft, the feel is heavy, and there is a heavy feeling. K gold jewelery is hard, the teeth are bitter, and the color is yellow in the middle. Gradually, the yellow is gradually shallow. The feel of gold jewelry is not as heavy as pure gold jewelry. In addition, both pure gold and K have seals, the seals on gold jewelry, useful "gold", and "one" English English The letter is expressed. It indicates the corresponding K number. In addition, the jewelry also marks the seal of the origin of different manufacturers.
gold plating jewelry is plated on the surface of other metal jewelry on the surface Gold jewelry is similar, golden and bright, and it is difficult to identify when new times. Red is white or blooming.
gold jewelry refers to 24 or 22K gold foil on other gold eagle surfaces, such as the pressure of the golden box, which is very low, and the softness is poor. The appearance is similar to the real gold jewelry, the golden light is sparkling, and it is not easy to fade, making it difficult to distinguish people. But carefully observe the depression, angle, back, etc. If there are broken joints on the jewelry, you can see that the disconnection of the gold bureau's material from then on is yellow and white. In addition, the feel of the gold jewelry is also lighter, the texture is harder than the pure gold jewelry, the teeth are bite the meta marks, and it is not easy to bend. It is not easy to bend. Jiu -wearing gold foil is easy to peel and fall off.
Whether it is gold jewelry, gold jewelry, or copper jewelry, it is generally not printed with gold jewelry. Or the printing is different from gold jewelry. There is an English letter "GK". It is "gold -plated". Or it is blurred by printing and signing. Consumers should identify whether there are printing on the jewelry, whether the printing is in compliance with the above provisions, whether the printing sign is clear and other aspects, etc. Content to judge the authenticity of gold jewelry.

(1) See color: the higher the purity of the gold jewelry, the deeper the color. Gold is the rules. The so-called green gold is only the golden ingredients in the gold); the dark red yellow color is more than 95 %, the light red yellow is 90-95 %, the pale yellow is 80-85 %, and the cyan yellow 65-70 %. The color green with white light is only 50-60 %, and the slightly yellow and white are less than 50 %. Generally, the Qiqing, Eight Yellow, and Jiu Chi can be used as a reference. (2) The weight of gold: The proportion of gold is 19 .32, weighing metals such as silver, copper, lead, zinc, aluminum. Gold like a volume is more than 40 % heavier than white silver, 1.2 times heavier than copper, 6.1 times heavier than aluminum. There is a feeling of sinking, and fake gold jewelry feels lightly Essence 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.
The accuracy of gold jewelry has two common methods.

(1) Testing gold stone method: Select the black test gold stone with delicate texture, use the standard tasting films with different gold content (on the gold medal) on the test gold stone, and then put the gold jewelry sample you want to identify in The scratches on the same goldstone, drip the concentrated nitric acid to remove the impurities, and find the traces left on the test gold stones compared with the traces of the tested slices. The accurate gold content of gold jewelry samples to be determined.

(2) Chemical method: also known as reagent test method. Gold is insoluble in separate nitric acid, sulfuric acid, and hydrochloric acid, and silver and copper ingredients can be dissolved with nitric acid. Take gold decorative sample. Putting nitric acid on a certain part, if gold will not change color, if it is silver products, it will generate silver oxide and turn black; For gold jewelry with a gold content of more than 95 %, test with nitric acid, the surface changes very small.