What to do if a silver necklace turns black? The silver necklace turned black while worn, what was g

The silver necklace turns black and can be cleaned with toothpaste.

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.

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.