An important factor of silver oxidation is that there is a great affinity between silver ions and sulfur ions, which is easy to produce chemical reactions. As a result of the reaction, silver sulfide is produced on the surface of silver. Because silver sulfide is grayish black, with the increase of silver sulfide, the surface color of silver gradually changes from white to yellow, then to gray, and finally to black. Silver rust: 4Ag+O2=2Ag2O 2Ag+S=Ag2S.

Solution:

1, you can add baking soda powder to clean water and then clean it.

2. Wipe with silver cloth and silver paste.

Wipe some toothpaste on the silver pot with a soft cloth, then wash it with clear water and wipe it with cotton cloth.

4. Soak the silver in water, then wash it with clear water, wipe it with cotton cloth and keep it dry. However, it is suggested that silver washing water should be used as little as possible, because silver washing water is a chemical product. Using the corrosiveness of silver washing water to clean silver ornaments will cause harm to silver ornaments for a long time.

Extended data:

function

First, disinfection and sterilization

In ancient times, people often used silver products to detect poison, which other metallic jade could not do. The statement that silver can be tested for poison is actually not scientific enough. Because the poison mentioned by the ancients mainly refers to highly toxic arsenic, namely arsenic trioxide, and the backward production technology in ancient times led to a small amount of sulfur and sulfide in arsenic, which is the main reason for the blackening of silver.

Silver can't test all poisons, but it can kill bacteria and diminish inflammation. Using silver tableware is not easy to make food ferment and sour, which is beneficial to health.

Second, purify the water.

Silver ions have a particularly strong bactericidal ability, which can sterilize and purify water. As long as there is one milligram of silver ion in every liter of water, most bacteria in water can be killed. The principle is that silver can form positively charged ions in water, adsorb bacteria in water and gradually enter bacteria, so that its catalyst-anchoring system is deactivated, and bacteria lose their metabolic ability and die.

Therefore, it is good to use silver to make dishes and chopsticks in daily life.

Third, diminish inflammation.

The use of silver in medicine can be traced back to BC. The ancients have long known that silver can accelerate wound healing and prevent infection. For example, silver compounds can treat burns, and wearing silver earrings at the beginning of ear piercing can also reduce inflammation and swelling.

Fourth, dehumidification.

It is recorded in Compendium of Materia Medica that silver has the function of "calming the five internal organs, calming the mind, stopping convulsions and eliminating evil spirits". The elimination of evil mentioned in Compendium of Materia Medica does not refer to any evil, but refers to the invasion of wind evil, such as rheumatism and heat toxin in the body.

V. Anticorrosion and Anticorrosion

Using silverware to store food can prevent the growth of bacteria and prolong the shelf life of food. Ethnic minorities in many areas of China like to hold food in silverware to keep it fresh and delicious for a long time.

References:

Baidu encyclopedia-silver