Copper handles can kill germs. Some people like to use beautiful stainless steel door handles because they look clean and reassuring, but this is not the case. The latest research results of American scientists show that thousands of germs may grow on stainless steel door handles, including gram-positive bacteria and negative bacteria, Escherichia coli and streptococcus. The researchers conducted the same test on brass door handles, and the results were surprising: there were far fewer bacteria on brass handles than on stainless steel handles, that is, copper had the effect of killing bacteria.

Experts conducted repeated experiments to determine the rate of bacterial death on copper. As a result, all the bacteria on brass were wiped out in 7 hours or less, and on the newly polished brass surface, the "war of annihilation" lasted less than one hour, only 15 minutes. Therefore, experts suggest that in order to protect the public health environment, especially in places such as hospitals, shops, airports and stations, it is best to use brass door handles. This is because brass can not only kill bacteria, but also is cheap. Why not. Please do not misunderstand that "copper green" copper and copper alloys have rich luster, which can be described as red, purple, yellow, blue and white. If copper is covered with green, it is "copper green". When it comes to "verdant", people can't help but misunderstand that it will cause harm to human body. In fact, that's wrong. "Copper green" is an oxide of copper. Its main components are basic copper carbonate and basic copper sulfate. These two double salts are blue-green, so they are called "copper green". "Copper green" is often covered on the surface of copper products in the form of film, which can prevent the continuous oxidation of copper and play a good role in protection. The majestic and beautiful sea blue and green appearance of the Statue of Liberty on the Atlantic coast is also a masterpiece of "verdant". Copper and its compounds are not as toxic to humans as some heavy metals. Since ancient times in China, copper products (such as copper kettles, copper pots and copper water containers) have been used for thousands of years. No case of "copper green" poisoning has been found, and no occupational disease related to copper has been found among workers engaged in copper and copper compounds.

Copper shows its friendly green face to mankind, and mankind will use copper reasonably to the maximum extent to maximize its benefits. The reason why copper handles can kill germs is that pure copper itself is prone to chemical reaction in the air and in the environment with low pH, forming a thin film, which can prevent copper from further chemical reaction. That is, after the chemical reaction, the ground film can inhibit bacteria, because there are complex components in human sweat. These complex components remain on the surface of copper, which can react with copper, Can generate: copper oxide; copper sulphate; Copper hydroxide, etc., leaves bacteria and sweat when people touch the copper handle. As a result, the bacteria on the surface of brass lose their living conditions and will die in a short time. However, one condition is that the copper handle must always be kept clean to generate an effective film, and the rusty copper handle is also a hotbed for bacteria to grow. This is why bacteria can only survive for 15 minutes on the newly polished brass surface. Stainless steel handles are beautiful and durable, but their chemical properties are very stable, which means they lose the advantages of being bacteria resistant like copper handles. The aluminum handle is also different from the copper handle. The stability of pure aluminum in the air is not high, but it is very stable once the aluminum oxide film is formed. The general cloth is not easy to damage this film when cleaning. Therefore, it is not helpful for sterilization. The copper handle is advantaged with this advantage, but because the cost of copper is much higher than that of aluminum and stainless steel, it cannot be popularized in life.