The coating behind the mirror is made of silver.
The coating behind the mirror is silver. Silver mirror reaction occurs between silver diammine and glucose. The silver mirror reaction is a chemical reaction in which a solution of silver compounds is reduced to metallic silver. Because the generated metallic silver adheres to the inner wall of the container and is as bright as a mirror, it is called the silver mirror reaction. Silver is applied by chemical "silver mirror reaction".
Add glucose water to the ammonia solution of silver nitrate. The glucose reduces the invisible silver ions into silver particles, which are deposited on the glass to make a silver mirror. Finally, just apply a layer of paint.
In recent years, many mirrors in department stores have been aluminum-plated on the back. Aluminum is a silvery white shiny metal that is much cheaper than precious silver. To make an aluminum mirror, aluminum is evaporated in a vacuum, and the aluminum vapor condenses on the glass surface to form a thin aluminum film.