wholesale fashion jewelry making supplies What is the purity of ancient golden ingots?

jewelry wholesale china See color: The higher the purity of gold jewelry, the deeper the color. As people often say "seven greens, eight yellow, nine purple and ten red", that is, if the gold decoration is blue yellow, the gold content can reach 70 %; the yellow content of yellow can reach 80-90 %; if it is red, the gold content can reach 95 or more. Of course, it is not enough to distinguish the color and true and false of gold jewelry by color. Type weight: The proportion of gold is 19.3, which is higher than other metals. The same volume of gold is 1.8 times the weight of the silver and 2.2 times the copper. Therefore, the real gold bearing should feel heavy in the hand, and the fake gold feels lighter to the sound: throwing the gold jewelry on the table, or on the hard ground, the lower the gold content, the greater the elasticity, the higher the jump, the crispy, the crispy is made, and the crispy is made. Sound, and there is a tone; the higher the gold content, the smaller the elasticity, the lower the jump, the sound of the sound is low, heavy, and no sound. Testing hardness: The higher the gold content of the jewelry, the softer the more soft, and it is easy to bend with your hands, good toughness, and not easy to break. Use hard things to leave clear scratches; the lower the gold content Bending and easy to break. When scratching with hard things, scratches are not obvious. Scientific test: First, use fire to identify. Put the jewelry in the smoke -free fire, and the color is unchanged after the pure gold is burned; The second is chemistry. With a concentration of 45 % or 70 % sulfuric acid, the gold has no change and keeps the original; the silver becomes black; Because metals such as silver and copper are dissolved in acid, chemical reactions will occur.