What is that reflective material painted on the mirror?
More than 300 years ago, the glass mirror was born. The shiny foil pasted on the glass surface, then pour mercury. Mercury is a liquid metal that dissolves tin into a thick, silvery liquid and attaches tightly to a glass plate. The glass mirror made a big step ahead of the bronze mirror, and it became very popular, and it was a treasure that the princes and nobles bought at once. At that time, only the factories in Venice produced the new glass mirrors, and all the countries in Europe went to buy them. Wealth poured into Venice like an ocean tide. The mirror factory is concentrated on the island of Murano, located around the guards, tightly sealed up. Later, the French government bought four Venice mirror craftsmen with a large sum of money and smuggled them secretly out of the country. Since then, the mystery of mercury glass mirrors came out openly, and its value is not so noble.
Speaking of the mirror, also has its history. More than three thousand years ago, our ancestors began to use bronze mirrors. It was made of bronze and polished and smooth and polished. The bronze mirror was not bright. It will rust and must be polished very often. However, in the era of no glass mirror, you can only use it
The mercury mirror didn't reflect the light very well. It was time-consuming and mercury was poisonous, so it was eliminated. The mirror now has a thin layer of silver on the back. This layer of silver is not painted, nor plated. It is painted on the silver mirror reaction of chemistry. In the aqueous solution of silver nitrate, add glucose water, glucose, the invisible silver ions reduced to silver particles, deposited on glass, made silver mirror, and finally painted a layer of paint on it. See here, you will say: "the thing on the back of the mirror is not mercury, it is silver."."This conclusion is behind the times again! In recent years, many mirrors have been painted on the back of the Department store. Aluminium is a silvery white, shining metal, much cheaper than expensive silver. Manufacture of aluminum mirror, in a vacuum to evaporation of aluminum, aluminum vapor condenses on the glass surface, a thin layer of aluminum film, radiant. This almirror cheap, promising. In this way, you will say: "I can not think of a small mirror, it is also developing and changing."! There are several chemicals on the back of it.
