Why does silverware turn black? Is it related to the body?

When the silverware is worn for a long time, it will gradually turn black. The ancients often use silver needles to test the poison. Is the reason for the discoloration of the silverware related to the body? Why does silverware turn black?

Is the silverware black and body related? The ancients said that the poison mainly refers to the highly toxic arsenic, namely arsenic trioxide. The ancient production technology is backward, causing a small amount of sulfur and sulfide in the arsenic. When the sulfur contained in it is in contact with silver, it can react chemically to form a black "silver-silver" on the surface of the silver needle. Some items are not toxic, but they contain a lot of sulphur, such as egg yolk. When the silver needle is inserted, it will turn black. On the contrary, some are very toxic items, but they do not contain sulfur, such as poisonous mites, pesticides, etc., silver needles are in contact with them, and there is no black reaction. Therefore, the blackening of the silver has nothing to do with the body.

Why did the silverware turn black? There are many reasons why silverware turns black. For example, sulfur, nitric acid and oxides in sweat, air and other substances (such as eggs and cosmetics) have a certain corrosive effect on silver. The silverware is worn for a long time. The combination of sulfur and silver forms a black silver sulfide film on the surface of the silver jewelry. It begins to appear as tiny spots, which then diffuse into pieces, forming what is commonly called silver scale. Black, affecting the surface gloss of silver jewelry. Silver jewelry is just a normal chemical reaction, no need to worry.

Although silver can not be disinfected, it can test poison. As long as it contains one million milligrams of silver ions per liter of water, most of the bacteria in the water can be killed. Silver ions can adsorb bacteria in water and gradually enter the bacteria, causing its catalyst-enzyme system to be closed and inactivated, causing the bacteria to lose their metabolic capacity and die.

Therefore, wearing silver jewelry often has great benefits to the health of the body. But remember not to buy on the stalls, you must go to the regular business to buy; allergies, scars, children, sweating more people are not suitable for wearing silver jewelry.