When metal unlined paint can with lid, they are often plated on the inner wall of a copper pot to prevent copper and warm water from forming toxic patina (basic copper carbonate). Toothpaste shells are also commonly used in tin (the toothpaste shell is made of two layers of tin sandwiched with a layer of lead. In recent years, China has gradually used aluminum instead of tin to make toothpaste shells). Solder, also containing tin, generally contains 61% tin, some are lead and tin, and some are composed of 90% lead, 6% tin and 4% bismuth.
Metal unlined paint can with lid are malleable at room temperature. Especially at 100 ° C, it is very malleable and can be extruded into extremely thin tin foil. Normally, people use tin foil to pack cigarettes and candy to prevent moisture. In recent years, China has gradually replaced aluminum foil with tin foil. Aluminum foil and tin foil are easy to distinguish - tin foil is much brighter than aluminum foil.
The tin with metal unlined paint can with lid only be malleable at room temperature. If the temperature drops below -13.2 °C, it will gradually become a loose powder of coal ash. Especially at -33 ° C or in the presence of an alcohol solution with a red salt (SnCl 4 · 2 NH 4 Cl), the rate of this change is greatly accelerated. At normal temperature, tin is a tetragonal crystal structure called white tin. When you bend a tin bar, you can often hear a squeak. This is because the tetragonal crystals of the tetragonal crystals rub against each other and make a sound. Below 13.2 ° C, white tin is converted into an amorphous gray tin. Then, the piece of tin becomes a mass of powder.