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Gold identification! The main varieties of gold jewellery include rings, earrings, necklaces, bracelets, brooches and so on. When choosing gold jewellery, it is necessary to identify the true and false first. 2, listen to the sound, gold fell behind on the ground, will be issued a "poof tick" sound, low content of the pronunciation clear crisp. The three is to look at the color. The luster of gold ornaments is long, the ornaments with high gold content are red, and the difference is yellow. The four is the test hardness, the higher the gold content of the ornaments, the softer the softer, with the hard needle point, there are obvious marks, and the low gold marks are blurred. Five fold bend. True gold is soft, with a hand cranked fold, easy to bend easily broken, and the color of the jewelry is not easy to bend easily broken. Six is to burn with fire. With the burning of fire ornaments, the real gold does not burn and does not change color, and the false gold loses its gloss and even becomes black and purple. The seven is acid test. Gold is insoluble in hydrochloric acid, sulfuric acid, nitric acid, and other metals change with tri acid. One, how to identify the jade Our main products are Guangdong jade "Southern jade" and "Henan jade" and "Shandong jade" in Xinjiang and Yili, and whether the "white jade", precious jade for. Identification of jade mainly depends on five characteristics, such as strong color (strong), Yang (bright), Qiao (Shai Mei), Zheng (Chun Zheng), and Rou He. On the contrary, if the jade light (Ping Dan), Yin (dark), old (dark color), flower (impure), oblique (uncoordinated), is liepin. Buy jade not to choose under the strong light, because the light will cause the jade to lose its original color, but also to cover up the defects, false and true. Choose and purchase Jade also also learn to identify the true and false. There are several common fake jade plastic, glass, marble, electrochromic etc.. Plastic and cloud stone than the jade light, hardness difference; bubble colored glass; electric color fake jade is a beautiful bright emerald green jade in the inferior plating appearance, at first glance are difficult to identify, but careful observation, inferior electric color often with some jade "spider claw", namely small cracks in green with blue. |
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