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Gold is a beautiful golden yellow metal with high density, low hardness, high melting point and high boiling point. Good ductility and plasticity, excellent electrical and thermal conductivity; gold has a fairly high chemical stability and does not oxidize with oxygen at any temperature.
Gold ornaments should not be in contact with corrosive liquids such as acids and alkalis.
Gold is insoluble in hydrochloric acid, sulfuric acid, nitric acid and other separate acids. It does not change when it is exposed to substances such as moisture, air, acids, alkalis, and salts. However, gold is soluble in a solution of aqua regia and other mixed acids at room temperature. Also soluble in potassium iodide, potassium cyanide solution and saturated water, chlorine water; gold and many elements are easy to form alloys, such as lead, nickel, tin, zinc, beryllium copper, silver, platinum, rhodium and so on. When gold and copper alloys are reddish, the color is white with silver alloys, and when alloyed with other metals such as nickel, it can form white... This is why the color of K gold jewelry is different. Foot gold jewelry has low hardness (Mohs hardness is less than 3). When wearing gold jewelry, avoid rubbing and rubbing with hard objects. If it comes into contact with hard objects, it can not only deform the beautifully shaped jewelry, but also make the surface of the jewelry damaged, scratches, weaken the reflection intensity of the jewelry surface and reduce the metallic luster of gold. This not only makes the jewelry lose its beauty, but also reduces the use value of the jewelry.
Gold ornaments should not be in contact with mercury
Mercury has a dissolution effect on gold, and the amalgam produces a yellow-white gold amalgam. Advanced cosmetics often contain small amounts of lead and wood. Gold jewelry is often in contact with cosmetics, and over time, it will cause white spots on the surface of the jewelry. In this case, the pure gold jewelry will be baked on the fire for a while, and the white spots will be lost. K gold jewelry contains a certain amount of silver and copper. The chemical activities of silver and copper are not as stable as gold. They have different degrees of chemical reactions under different conditions, such as acid and alkali.
Therefore, do not wear jewelry in places with high levels of sulfur dioxide, hydrogen chloride, hydrogen sulfide, etc., where chemical pollution is serious: avoid contact with K gold jewelry for a long time with acidic, alkaline substances and perspiration. Places with lead pollution, such as printing houses, should also avoid wearing gold jewelry. Because lead has a trapping effect on gold (in the case of high temperatures). Long-term exposure to lead, lead particles can also accumulate on the surface of gold jewelry. In short, after the gold jewelry is corroded by such chemicals, the surface will be discolored and dark. In this case, always use a toothbrush and a small amount of toothpaste to gently brighten the K gold jewelry and rinse it with water. Or to professional manufacturers, businesses polishing and cleaning.
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