Gold jewelry rapid identification method
There are many methods for identifying gold jewelry published on the Internet. After a long period of experience and research, a set of simple methods has been summarized in the jewelry industry. The formulas are: look at color, weigh, listen to rhyme, fold hardness, stone grinding, and contrast Brand, use acid points, set the color. The first four sentences rely on eyesight and feel; the last four sentences need tools and reagents. 1. Look at the color. According to the different luster and color of gold, you can roughly distinguish between pure gold, K gold, real gold, and fake gold jewelry. There are many methods for identifying gold jewelry published on the Internet. After a long time of experience and research, it is summarized in the jewelry industry. A set of simple methods, the formula is: look at the color, weigh the weight, listen to the rhyme, fold hardness, stone grinding, contrast cards, use acid points, set the color. The first four sentences rely on eyesight and feel; the last four sentences need tools and reagents. One, look at the color According to the different luster and color of gold, you can roughly distinguish pure gold, K gold, real gold, and fake gold. That is to say, gold is preferably red-yellow, and the fineness is above 95%; the normal yellow fineness is about 80%; the blue-yellow fineness is about 70%; the yellowish grayish color is about 50%. Therefore, there is a formula for 'seven green, eight yellow, nine five red, yellow white with gray and half gold'. For jewelry that was first released for a long time, there is a saying that 'copper turns green, silver turns black, and gold never changes color'. Second, look at the density The density of gold is 19.32 grams/cubic centimeter, which is about twice as heavy as the same volume of silver, lead, and tin. The available formula: the mass (gram) of a certain gold jewelry is equal to the density of the volume (cubic centimeter) of a certain gold jewelry. Calculate the density of the measured gold jewelry. If the density is about 19.32 g/cm3, it is pure gold or relatively pure gold, otherwise it is not pure gold or gold with poor color (this method is not harmful to jewelry). Third, folding hardness Gold has the characteristics of ductility and low hardness, and can be pressed into a sheet with a thickness of 12.7 microns. When the color is high, scratching with a pin or nail can leave marks. Gold jewelry with a fineness of more than 97%, after bending two or three times, wrinkles appear at the bends, also called fish-scale patterns; gold jewelry with a fineness of about 95% feels hard when bent, and the fish-scale patterns are not obvious; about 90% of gold is colored Jewelry is very hard when bent and has no fish-scale patterns; gold jewelry with more impurities will break when bent two or three times; if it is made of raw gold, it will break when bent, and the section has obvious sandy grains. When using this method, the width and thickness of the jewelry should be considered. Thick and wide ones are harder, and thin and narrow ones are softer. 4. Listen to the rhyme and see that gold jewelry with high elasticity and color is knocked or thrown on the hard ground, and it makes a dull low sound of 'pock, puffElasticity, the greater the elasticity and the sharper and longer the rhyme, the worse the color. 5. Use the touchstone to identify the color Use the gold pair plate (the gold medal with the color determined) and the tested jewelry to grind on the touchstone, and compare the color to determine the color of the gold jewelry. This method should be carried out under natural light and fluorescent lamps, not under direct sunlight and incandescent lamps. 6. Use acid point to grind out the gold channels of the identified jewelry and the matching brand on the touchstone. Use a glass rod to test nitric acid on the gold channels. Because the chemical properties of gold are stable and do not react with acid, the color does not change. If it is not gold or pure gold, the golden path disappears or changes. The law of change is 'three fast and three slowDepending on the disappearance of the golden road, the fineness of the gold jewelry can be determined by comparing the right cards. The above is the gold jewelry identification information summarized by the author for you. The information comes from the Internet. If there is anything wrong, please forgive me. If you need knowledge and understanding of gold jewelry processing, please pay attention to jewelry setting. Jewelry setting is waiting for your inquiry!
