银手镯变黑的相关知识（The knowledge of black silver bracelets）

银手镯变黑的相关知识（The knowledge of black silver bracelets） 银手镯变黑的相关知识(The knowledge of black silver bracelets) Why does a silver bracelet go black? One of the important factors that have a great affinity between silver ions and sulfide ions, easy to produce chemical reaction, the reaction of silver is formed on the surface of silver sulfide, because silver sulfide is black, so with the increase of silver sulfide, silver surface color has gradually changed from white to gray yellow and finally black. This chemical change can occur in the case of a trace amount of silver in the air, as long as the case of hydrogen sulfide gas to trillions of tens of trillions of Hugh or sulfur ions, this chemical reaction will occur. People also have sulfur in their sweat, which makes silver tarnish when it comes into contact with silver products, especially the hydrogen sulfide produced by sewage and garbage emissions in urban air, so silver discoloration is not surprising. Understand why silver becomes black, can be targeted to take some measures to prevent silver black, usually wear silver when good, should pay attention to some aspects: 1, usually do not take, sealed storage, small plastic bags can be used to isolate the air, reduce oxidation opportunities, keep jewelry often new; 2, silver and other alloy jewelry, try not to touch water and stimulating liquid. Silver jewelry in the hot spring when you take off, usually you can wear, but to avoid contact with sulfur soap, hair dye, perm and other easy to damage the surface of silver jewelry; 3, we must pay special attention to the silver jewelry inlaid stone, cannot touch water, because there will be a gap junction with water when the stone is easy to fall off; 4, the smooth surface of the jewelry, usually can use delicate fingers towel or soft cloth for wiping, along the same direction back and forth wipe, can avoid excessive marking, The best effect is to use a professional wipe silver cloth; 5, bright silver jewelry can use wash water, wash with plenty of water after washing, and finally with a small amount of alkaline water (such as soap water or detergent water) to wash and for a moment, then with clear water clean, dry with a soft cloth. Finally use washing powder and go over to neutralize the acid wash water, wash water can really play a role; 6, do the old process of silver jewelry, use wipe silver cloth wipe, or use toothpaste brush wash processing can reply light, remember not to use silver washing clean water, otherwise it will destroy the above do old process; 7, to the right of jewelry cleaning, wear in a proper way; that should start from the wrist to catch the narrow side with the place, and then rotate around the wrist to the normal position, not hard, otherwise it may cause a stone falling or bracelet bracelet itself deformation. Cleaning method for silver ornaments: 1, with professional wipe silver cloth, silver (in addition to platinum plating process) surface cleaning. : 2, with professional wash water, but by soaking method (old technology) or wiping method (except platinum plating process and mosaic process), will silver ornaments in silver wash water for about three minutes (oxidation especially serious can put a long time, some) after removal of repeated rubbing washing, with plenty of clear water scouring net, into the basic sleep (for example detergent water) in the lake wash, rinse with water. 3, use toothpaste (try to use green transparent jelly, the toothpaste fine particles, avoid scratch silver surface) the toothpaste wipe directly to wipe the silver, add a little water after contusion, out of the bubble, if there is a sewing place with a toothbrush scrub, Avoid foam entering the seam Silver is black because it has reacted with oxygen in the air for a long time. It is oxidized and the general oxides are black. As for why the use of toothpaste will be restored, in fact, toothpaste contains some silicon particles, there will be friction, play a role. But more important is the toothpaste which contains a lot of acidic components, these oxides with those reactions, remove the black oxide generated by oxidation reactions. As for why acid components, don't forget some toothpaste inside in order to enhance the effect, will add fluorine substance, but the strong acidic substances, there is a very good that Oh, if your cup with a long time there will be some theophylline in the cup, wash off, you use toothpaste to wash, easy to remove, theophylline is an alkaline substance, it also proved that the toothpaste containing acid so that the last sentence: the reason why ah toothpaste can remove metal the necklace is black, because the toothpaste containing acidic substances will react with the metal oxide, which went black. But after washing with toothpaste, it becomes dark again because darkening is the phenomenon of silver sulfuration. The more sulfur content in the air, the greater the degree of blackening of silver jewelry, not the acid content of the body. Instead, the blackened silver jewelry is heated and put into phosphoric acid solution to completely remove the silver sulfide layer, which makes the silver jewelry shiny. Silver jewelry processing last process is this, of course, but also polished. Silver jewelry is badly black sulfide, only pickled. Slightly black, toothpaste can be used to scrub the way, with a toothbrush dipped in toothpaste, carefully scrub better. It can also be washed with detergent and dipped in soft cloth. Wearing silver jewelry is good for your health. Silver ion is a good poison killer. It can also purify drinking water, and field travel is a must. In order to avoid the silver jewelry to produce black sulfide, it can be painted on the surface of silver jewelry to protect the layer, a very thin layer of fat can be, you can also paint white nail polish.