Why does silver turn black?

Question 1: Why does silver turn black after wearing it for 5 minutes? The silver ornaments you often wear will absorb the oil on people and become bright, but when people are uncomfortable, such as catching a cold, they will turn black and naturally return to their original state after recovery. If it turns black because it has been worn for a long time, you can wipe it with a silver cloth or with toothpaste. My silver chain will turn black and oxidized if it is left there for a while.

Also, it is normal that the weather is hot and sweaty in summer and the dirty things in the air turn black.

Question 2: Why does pure silver turn black when worn for a long time? Why does silver turn black?

First, because everyone's endocrine and physical condition are different, some people's sweat contains more acid, some people have less, and some people's body fluids have high sulfur content. These are all substances that cause the surface of silver ornaments to turn black, so everyone will have different results when wearing silver ornaments, and some people will be as bright as new after wearing them for half a year.

Second, sulfur, nitric acid and oxides in air and other substances (such as eggs and cosmetics) have a certain corrosive effect on silver. Silver jewelry is worn for a long time, and the combination of sulfur and silver will form a black silver sulfide film on the surface of silver jewelry. At first, it will show some tiny spots, and then spread into pieces, forming what people usually call silver scales, turning black and affecting the surface luster of silver jewelry. People usually mistake it for fading.

It is precisely because of these natural characteristics of silver that silver has a good health care function, and it can neutralize toxic substances in the human body when worn frequently. Silver ion has a strong bactericidal effect, which can kill 650 kinds of germs, and can be used as a tool for poison detection, which is very beneficial to human body. It can also accelerate wound healing, prevent infection, purify water and keep fresh. As the ancients said, wearing silver is accompanied by health and wealth, and the five internal organs are safe, the mind is calm, and the shock is stopped and the evil spirits are eliminated. In medicine, it has a much greater effect on human health than other precious metals.

Solution to blackening

If the silver jewelry turns black, don't rush to wash it with silver water, because silver water is a chemical agent and has a certain corrosive effect on the jewelry. Silver cloth is your first choice. There are many small remedies, such as soaking silver jewelry in coke for the night, or brushing it with a soft brush dipped in toothpaste ... but remember to dry the water with cotton cloth after washing.

Cleaning and maintenance methods of silver ornaments

Many people like silver ornaments, but little is known about their maintenance. Some people even think that silver jewelry is difficult to maintain, but it is not. After understanding the reasons why silver ornaments turn black, we only need to spend some time in our daily life to make the silver ornaments we wear last as long as new.

1, silver jewelry should be cleaned before it is put away, and it is best to pack it in a closed bag to prevent oxidation and blackening. If the wearer sweats a lot, he can wipe the surface with a soft cloth every day to keep the luster and remove dirt. It is best to use special silver rubbing cloth for silver ornaments plated with platinum. Silver rubbing cloth can be purchased in silver jewelry brand stores. Note: Silver cloth contains maintenance ingredients and cannot be washed.

2. Daily cleaning of silver ornaments without platinum plating can be done by yourself, such as squeezing some toothpaste, adding some water, wiping with a soft cloth, brushing gaps with a soft toothbrush, and then rinsing with clear water. Don't touch the water on the silver ornaments inlaid with precious stones, so as not to affect the firmness of the glue. It is best to be cleaned by professionals in the store. )

There are many kinds of silver ornaments and different maintenance methods, so we can't generalize them. Many online maintenance methods can only be used as reference. It is best to ask the professionals in the store to avoid improper operation and damage to the beloved silver jewelry.

4, including the exquisite three-dimensional carving of silver ornaments, to avoid deliberate polishing. If you find that the silver ornaments are yellow, you should first clean up the thin seams of the silver ornaments with a small jewelry brush, and then gently wipe the surface with a silver cloth to restore the original silvery white and brightness. I suggest that if the silver cloth can recover about 80% silver, there is no need to use silver lotion and silver washing water, because these products are corrosive to some extent, and silver ornaments are more likely to turn yellow after using these products. Silver wipes contain silver maintenance ingredients and cannot be washed.

5. If the silver jewelry is not treated and collected after wearing, it is very likely that the silver jewelry will turn black. At this time, you should use a small jewelry brush to clean the fine seams of jewelry, then drop a drop of silver emulsion on the paper towel to wipe off the black oxide on the surface of jewelry, and then use a silver cloth to restore the original brightness of jewelry. After that, you should remember to do the daily general maintenance to prevent the silver ornaments from turning black again. It is difficult to rub the silver ornaments white after many times of blackening.

Benefits of wearing silver jewelry:

Benefit 1: sterilization

Silver ions contained in silver ornaments have a strong bactericidal effect, which can kill 650 kinds of bacteria. You know, general antibiotics only work on six kinds of bacteria, which shows how strong the bactericidal effect of silver jewelry is.

Benefit 2: Drug abuse

Many people will wonder why silver jewelry will slowly turn black after being worn for a long time. In fact, it is because silver reacts with many toxins that silver ornaments turn black. We have all seen poison detection with silver chopsticks on TV, and the principle is the same. While helping to suck out human toxins, we can also judge the health status of the human body according to this, which can be described as killing two birds with one stone.

Benefit 3: Heat transfer

Silver has excellent thermal conductivity. Wearing silver jewelry for a long time can ... >>

Question 3: Why does silver turn black after a long time? If silver is not properly worn or stored, the surface of silver will be oxidized or polluted by strong oxides in a strong oxidizing environment, which is the reason why silver turns black.

Toothpaste is a good helper to remove the blackness of silverware. Toothpaste is rich in fine calcium carbonate particles, and the friction of these particles can wipe off the silver oxide on the surface. Find a toothbrush, patiently wipe it with a little toothpaste for a while, and then wash it with clean water. After scrubbing with toothpaste, be sure to rinse with clean water, preferably pure water, not chlorinated tap water. Tap water containing residual chlorine can easily lead to the formation of silver chloride on the surface of silverware. When silver chloride is decomposed by light, it will still lead to the surface blackening of silverware.

Pay attention to the maintenance of polished silver, and do not contact with all kinds of strong acids, alkalis, strong oxidizing substances or sulfides. Now many people pay great attention to hygiene. They often wash their hands with various soaps, hand sanitizers and disinfectants, and bathe with soap. These washing products will also cause silverware to turn black, especially sulfur soap, which will produce black silver sulfide. Therefore, when personal care, try not to touch the detergent on the silverware, and it is best to take off the silverware.

Question 4: Why does silver turn black? It is a normal natural phenomenon that silversmiths turn black. Because sulfur and oxides in natural media such as air have a certain corrosive effect on silver, after wearing for a period of time, some tiny spots (silver sulfide film) will appear, which will spread into pieces or even turn black for a long time. Therefore, at present, silver jewelry has some discoloration due to oxidation. Here are some suggestions:

First of all, we should strengthen maintenance knowledge: most consumers know that silver will turn black, but they don't know how to prevent it from turning black, and they don't know what to do if it turns black-this is the fundamental reason why some consumers are unwilling to buy silver ornaments. Therefore, teaching how to maintain and remove the oxide on the surface of silver ornaments and restore the luster of silver ornaments is the guarantee of consumers' confidence in buying. Mainly do the following work:

① Don't wear other precious metal jewelry when wearing silver jewelry to avoid collision, deformation or wear. (2) Avoid contact with water vapor and chemicals, and avoid swimming in clothes, especially in the sea.

③ Wipe it with cotton cloth after wearing it every day, and put it in a jewelry box or bag for sealed preservation.

(4) It has been oxidized to black, which can be scrubbed with a soft brush dipped in toothpaste or cleaned with hand sanitizer or detergent. If it is really impossible to clean, brush it with silver washing water and dry it with cotton cloth after washing.

The above is taken from17656/12/371504.

I hope I can help you.

good luck

Question 5: Why does silver turn black? Silver ornaments and silver handicrafts often change color over time.

The laws of nature tell us that any substance will become unstable at high energy after absorbing energy, which is scientifically called thermodynamic instability. Therefore, the metal will naturally release energy and try to return to the original extremely stable ore state. For example, silver is metallic silver obtained by heating argentite (Ag2S) at high temperature. On the one hand, its performance is very unstable due to the increase of its own energy. Another important factor is the great affinity between silver and sulfur. Scientists have determined that when silver meets hydrogen sulfide gas or sulfur ions in the air, it is easy to form an extremely insoluble silver salt (Ag2S) (silver salt is the main component of argentite). The amount of this chemical change is very small. As long as silver meets hydrogen sulfide gas or sulfur ions in the air, the following chemical reactions will occur: 4Ag+2H2S+O2 = 2A.

As a result of the reaction, silver sulfide is produced on the surface of silver. Because silver sulfide is gray-black, with the intensification of the reaction, silver sulfide increases and thickens, and the surface color of silver gradually turns from white to yellow to gray, and finally turns black.

And where did the silver sulfide come from? It is a natural product. First of all, human and animal feces will produce a lot of hydrogen sulfide after bacterial decomposition, and protein in plants will also produce hydrogen sulfide after corruption; In addition, human sweat also contains sulfur, and contact with silver products will make silver discolor, especially the hydrogen sulfide produced by sewage and garbage discharge in urban air is even more amazing, so it is not surprising that silver discolors.

Prevent silverware from blackening: Hydrogen sulfide and sulfide will blacken silverware. Because there is sulfur in the air and some foods (such as vegetables and eggs) contain hydrogen sulfide, silverware must be cleaned as soon as possible after use to avoid sulfide (commonly known as oxidation). After cleaning, classify the utensils, put them on a shelf, soak them in chlorine-free dilute alkaline water above 40 degrees Celsius for 10 to 15 minutes, then take them out, rinse them and dry them thoroughly. The spots on the rice knife edge are wiped off with a cloth soaked in vinegar, and then rinsed dry; Another method is to soak the onion cut in half in pure white sugar to wipe the blade, then rinse it and dry it. Blackening of silverware: soak silverware in 78℃ salt water or soda water with aluminum foil 1 to 3 minutes. Automatic tank washing can keep constant temperature and control time, and circulating water pump can make salt water rise and fall. This electrolytic method is effective only when the silverware is free of grease.

Polishing silverware: Dry clean it with a sponge or cotton fabric coated with polishing agent, and then polish it with a clean and soft towel or absorbent cotton. A good brightener will only leave an invisible protective film.

Question 6: How did the silver turn black when it was put there? If silver is exposed to air for a long time, it will be oxidized and the surface will turn black.

There are many treatment methods, such as brushing teeth with toothpaste and toothbrush, scrubbing with vinegar, and soaking in cola 12 hours or more. There are also special silver cloth and silver washing water. The reason is the same. Either remove the oxidized part or reduce the oxidized part.

Question 7: Why do some people turn black when they wear silver? Because everyone's endocrine structure is different, some people's sweat contains more acid, some people have less, and some people have high ammonia content, so the effect of wearing silver ornaments is different. Acid is easy to black, acid is not easy to black, and even some people with strong oil secretion will bring their silver ornaments to shine.

Most of the silver ornaments are electroplated (except a few silver ornaments), so please don't use silver cloth easily, but even electroplating needs good maintenance, so please try not to wear silver-plated ornaments when you sweat a lot.

The blackening of silver ornaments is a normal natural phenomenon. Because sulfur and oxides in natural media such as air have a certain corrosive effect on silver, after wearing for a period of time, some tiny spots (silver sulfide film) will appear, which will spread into pieces or even turn black over time. Therefore, at present, silver ornaments will have some discoloration due to oxidation.

It is normal for silver ornaments to turn black, but if they are maintained daily, they can be kept for a long time. Most consumers know that silver ornaments will turn black, but they don't know how to prevent them from turning black and what to do. This is the fundamental reason why some consumers are unwilling to buy silver ornaments. Therefore, teach how to maintain and remove the oxide on the surface of silver ornaments. The method of restoring the luster of silver jewelry is the guarantee of consumers' confidence in buying. The following points should be done: ① Don't wear other precious metal jewelry at the same time when wearing silver jewelry to avoid collision, deformation or wear; (2) avoid silver jewelry contact with water vapor and chemicals, and avoid wearing swimming, especially when going to sea; (3) clean it with cotton cloth after wearing it every day, and put it in a jewelry box or bag for sealed preservation; (4) Silver ornaments have been oxidized and blackened, so you can use a soft brush dipped in toothpaste; You can also rub it by hand.

The best way to maintain silver jewelry is to wear it every day, because the oil of human body will make silver jewelry emit warm and natural luster (there are exceptions, of course, some people's sweat itself contains ingredients that make silver jewelry black). When you don't wear it at ordinary times, you should put it away, and it is best to pack it in a closed bag to prevent the surface of silver ornaments from being oxidized and blackened by air. When wearing, wipe the silver surface with a soft cloth every day to keep it shiny. But it's best to use special silver cloth. Daily cleaning method: squeeze a little toothpaste on the silver jewelry, add water, knead it properly until white bubbles appear, and then rinse it with clear water to restore brightness.

Question 8: Will silver turn black? What if it turns black? Hui 1. Silver cloth is a kind of maintenance cloth containing maintenance liquid. You can directly polish the black and oxidized places with silver cloth, which is relatively harmless to the silver ornaments, but it is difficult to clean the delicate parts, and the silver cloth must not be washed with water, which will reduce the service life.

2. Silver rubbing emulsion is a milky white silver rubbing agent. You can use a soft cloth or brush to wipe the fine parts and restore the luster of the fine seams of silver jewelry.

3. Silver washing water is the fastest tool to remove oxidation and the cleanest cleaning method, but it is also the most harmful to silver jewelry, because silver washing water washes away the original protective film of silver jewelry, which is easy to hurt silver itself.

4. If you don't have these special materials and tools for maintaining silver jewelry, you can use your daily toothpaste to remove the black part of silver oxide, because toothpaste contains fluorine, which has the effect of removing silver oxide. The use method is the same as that of wiping silver milk, which is more suitable for wiping smooth silver jewelry.

Question 9: Why do I turn black when I wear a silver bracelet? Some people feel that there is something wrong with their health when they see that the silver bracelet they wear turns black. Some people think that it is not good silver that they bought, which makes the silver bracelet easy to turn black. So why did the silver bracelet turn black? To sum up, there are three main reasons:

First, silver is an unstable element, which easily reacts with sulfur, leading to blackening. Human sweat contains a lot of sulfur, which will work when it comes into contact with silver ornaments. Moreover, if people are in some polluted environments and there are many compounds such as acid gas, hydrogen sulfide and nitric oxide in the air, the silver ornaments will turn black. Even under normal circumstances, the surface of silver jewelry will be oxidized and the color will become dull after being worn for about half a year. That's not innocent. It was oxidized and blackened. You can scrub with a soft brush dipped in toothpaste, or you can rub soap or detergent by hand. If it is really impossible to clean, brush it with silver washing water and dry it with cotton cloth after washing.

Second, because everyone's endocrine and physical condition are different, some people's sweat contains more acid, some people have less, and some people's body fluids have high sulfur content. These are all substances that cause the surface of silver ornaments to turn black, so everyone will have different results when wearing silver ornaments, and some people will be as bright as new after wearing them for half a year.

Third, sulfur, nitric acid and oxides in air and other substances (such as eggs and cosmetics) have a certain corrosive effect on silver. Silver jewelry is worn for a long time, and the combination of sulfur and silver will form a black silver sulfide film on the surface of silver jewelry. At first, it will show some tiny spots, and then spread into pieces, forming what people usually call silver scales, turning black and affecting the surface luster of silver jewelry. People usually mistake it for fading.

It is precisely because of these natural characteristics of silver that silver has a good health care function, and it can neutralize toxic substances in the human body when worn frequently. Silver ion has a strong bactericidal effect, which can kill 650 kinds of germs, and can be used as a tool for poison detection, which is very beneficial to human body. It can also accelerate wound healing, prevent infection, purify water and keep fresh. As the ancients said, wearing silver is accompanied by health and wealth, and the five internal organs are safe, the mind is calm, and the shock is stopped and the evil spirits are eliminated. In medicine, it has a much greater effect on human health than other precious metals.

Question 10: Why does silver turn black after wearing it for 5 minutes? Silver ornaments that are often worn will absorb the grease on people and become bright, but when people are uncomfortable, such as catching a cold, they will turn black and naturally return to their original state after recovery. If it turns black because it has been worn for a long time, you can wipe it with a silver cloth or with toothpaste. My silver chain will turn black and oxidized if it is left there for a while.

Also, it is normal that the weather is hot and sweaty in summer and the dirty things in the air turn black.