The silver necklace turned black while worn, what was going on

What is the reason why wearing a silver necklace turns black.

Silver necklaces are a type of jewelry that many women love. Silver necklaces are comparatively cheaper than gold necklaces. Many women who do not have independent financial ability are wearing silver necklaces, and some people even feel that silver necklaces can have a good health effect, so they like to wear silver necklaces.

But what is the reason why silver necklaces turn black after being worn for a long time?

1. The reason why silver necklaces turn black is because silver is an unstable metal, which will turn yellow and black due to external factors, when the air contains hydrogen sulfide.

, the surface of the silver necklace loses its silvery-white luster due to the transformation of silver and H2S from the air into black Ag2S. its chemical reaction.

The equation is: 4AG + H2S + O2 = 2AG2S + 2H2O

The result of the reaction is the production of silver sulfide on the surface of the silver.

Because silver sulfide is gray-black, with the intensification of the reaction, the silver sulfide increases and thickens, and the surface color gradually changes from white to yellow to gray and finally black.

2. Silver ions contained in silverware.

It has a bactericidal effect, but silver jewelry worn outside the body does not have such a great effect on the human body. Silver is an unstable element that is prone to chemical reactions with sulfur, resulting in blackening. Human sweat contains a lot of sulfur and silver jewelry.

contact, it will change color due to action.

Cleaning method. 1. First squeeze a small amount of toothpaste into your hands, add a little water to knead a rich foam, gently knead the silver jewelry, wipe with a soft cloth until bright, wipe the toothpaste and water in the palm of your hand and then wipe or brush, do not use too much force, and then rinse with water and wipe dry with a cloth.

2. When cleaning the silver necklace, you can find a small plastic bag, put the silver jewelry in it, then squeeze a small amount of toothpaste into your hand, add a little water to knead the rich foam, pour the toothpaste water with foam into the bag, rub it repeatedly, and then rinse it with water.

Many people who like sterling silver necklaces may have this question, that is, whether sterling silver necklaces will turn black. Sterling silver necklace is a relatively active metal, sterling silver necklace is easy to contact with sulfur in the air, which is easy to lead to oxidation, and it is easy to turn black. The main culprits of the blackening of sterling silver necklaces are sulfur and chloride, and sulfur is the main factor that makes silver black, and silver will react strongly when it comes into contact with sulfur-containing substances.

That's why silver jewelry that usually turns black after washing sulfur soap and soaking in hot springs.

There is also a sterling silver necklace that will turn black if you don't wear it, put it aside at will, and then seal it if you don't clean it, so you must pay attention to maintenance, don't swim while wearing it, don't approach the hot springs, and the sea water contains sulfur and chlorine substances.

Generally, when the silver jewelry turns yellow, it can be restored to the original silver white and bright with a simple treatment of silver cloth or silver washing water. However, if the silver jewelry is blackened by the sulfur reaction, it is difficult to have an effect, so it is necessary to go to the jewelry store to clean it.

Silver necklaces are easy to change color after wearing them for a long time, and they can even turn black. **It is a reactive metal that easily reacts with external elements and changes color. Secondly, it also has a lot to do with the purity of silver.

First of all, the chemical properties of silver determine that the chemical properties of silver are not as stable as ** or platinum, and silver necklaces with untreated surfaces are very easy to lose their original luster due to oxidation or strong light exposure. In TV dramas, it is often seen that silver needles are used to test poison, which is poisonous, and the silver needles turn black. In fact, silver has undergone an oxidation reaction.

When silver comes into contact with oxygen, sulfur and other substances, it will oxidize and form oxides, which will lose its original luster and eventually turn black.

Secondly, the purity of the silver necklace also has a certain relationship, if the purity of the silver necklace is different, the speed of the necklace oxidation and discoloration is also different, the purer the silver necklace, the faster the oxidation rate, for example, the oxidation rate of 925 silver will be slower than the oxidation rate of 999 silver.

In daily maintenance, one is to keep the silver necklace dry, and the other is to wipe the yellowed silver necklace with toothpaste or silver cloth to restore the luster.

Silver is an unstable element that is prone to chemical reactions with sulfur, resulting in blackening. Human sweat contains a lot of sulfur, which will work when it comes into contact with silver. Moreover, if people are in some polluted environments, when there are more acidic gases, hydrogen sulfide, nitric oxide and other compounds in the air, it will also cause silver jewelry to turn black.

Even under normal circumstances, silver jewelry will be worn for about half a year, the surface will oxidize, and the color will become dull and tarnished.

The silver bracelet turns red, which may be due to the presence of antimony or arsenic in the silver jewelry, which will turn brick red when interacting with sulfur, indicating that the composition of the silver jewelry is seriously impure.

In recent years, more and more people are wearing silver jewelry, whether it is silver bracelets, silver necklaces or silver rings, which are favored by many consumers. But the problems that come with it are also troubling: silver jewelry tends to turn black.

Silver reacts chemically with sulfides to produce black silver sulfide. If the silver jewelry you carry with you suddenly turns black and you can't help but be afraid, is there something wrong with your health?

Silver needles can be used to detect drugs, so what's going on with our silver jewelry turning black? In fact, the purification technology of arsenic in ancient times was insufficient, so it would contain sulfur, and it was not arsenic that reacted with silver needles, but sulfur. Therefore, the statement that "silver jewelry turns black indicates that the body is unhealthy" is not scientific, and the silver jewelry we usually see is just a normal chemical reaction between silver and oxygen, and it is not directly related to physical health.

Therefore, the phenomenon of silver jewelry blackening that we usually see is just a normal chemical reaction between silver and sulfur, and it is not directly related to the health of the body. The ** sulfur generally comes from a small amount of sulfide in the air, and personal living habits (such as taking silver jewelry to bathe or washing the face with excessive sulfide in the water) and even personal physique (such as whether it is easy to sweat) has a great relationship.

How do you restore luster to silver jewelry? You can find a lipstick that you don't use, apply it to a napkin, and rub the bracelet vigorously, by rubbing the tissue, the blackened bracelet can be brightened; Bracelets can be rubbed, but what about silver necklaces? You can find a piece of aluminum foil, put some water in the pan for stir-frying, sprinkle some salt, put the aluminum foil on the bottom of the pan, put the silver jewelry in the pan when boiling, and in just a second, the hand ornament will become shiny.

1. Use Coca-Cola soaking, soaking time is 12 hours.

2. Adopt the method of applying lipstick to the cloth, then wiping the silverware, and finally rinsing with water.

3. Use acetic acid to scrub.

4. Use overnight tea steeping.

5. Use a silver cloth to wipe.

6. Soak in silver water for one to two minutes.

7. Use the correction liquid to coat the silver jewelry, and wipe the silver jewelry with a cloth before the correction liquid is dry.

8. Use toothpaste and toothbrush to scrub.

Silver necklaces turn black as soon as they are worn, probably because of an oxidation reaction between the silver and the air, causing the surface to produce oxidized silver. It may also be due to an oxidation reaction between silver and the element sulfur, which produces silver sulfide. It may also be because the silver necklace comes into contact with sweat, tap water, oil smoke and other substances, causing the silver to have a chemical reaction.

1. Oxidation reactionThe silver necklace turns black as soon as it is worn, probably because of the oxidation reaction. Because silver is more reactive, it will undergo an oxidation reaction when it encounters oxygen, and then form a layer of black silver oxide on the surface of the silver necklace, resulting in blackening.

2. The silver necklace turns black as soon as it is worn, probably because of the sulfurization reaction. When silver encounters sulfur, a chemical reaction occurs, which produces black silver sulfide, or silver scale, on the surface of the silver necklace, which turns black.

3. The silver necklace of chemical substances turns black as soon as it is worn, probably because of some chemicals. Sweat in the human body, tap water in life, and oil smoke in the kitchen, etc., these substances contain certain harmful ingredients, and silver necklaces will turn black when they come into contact with these substances.