Because the container of thermos bottle is double-layered, the silvery white on the container is mostly made of aluminum like a thin silver layer, which is plated in the interlayer. Its main purpose is to produce silver mirror reaction and reduce radiation heat dissipation. Will not fall off, harmless, even if it falls off, it has nothing to do with water, it will only affect the heat preservation time of water.
The thermos bottle, also called thermos bottle, was invented by British scientist Dewar. In the vacuum chamber, a layer of silver or reflective coating is coated to block the thermal radiation. Plug the bottle with another stopper. In this way, the three ways of heat conduction are cut off, and the bottle liner can keep the temperature for a long time. He used this bottle to store liquid hydrogen. Widely used, almost every family has a thermos bottle, that is, a thermos bottle.
References:
Baidu encyclopedia-thermos bottle