If jewelry is worn or stored for a long time, we will find that it will lose its luster and its color will darken. We can put dim jewels in a jewelry box. Next, divide the chalk we prepared into several sections and put it in the jewelry box. Chalk As long as you put a short piece of chalk in the jewelry box, the jewelry can always keep shiny, because the surface of the jewelry is easily oxidized and blackened by water.
After a while, you will find that jewelry will be very shiny. The color is the same as the first one. The composition of chalk is gypsum, and the chemical composition is calcium sulfate. Calcium sulfate, chemical formula CaSO4. The melting point is 1450 degrees, and the relative density is 2.96. Insoluble in water. Its calcium sulfate dihydrate. 2H2O is usually called gypsum. Calcium sulfate is stable, non-toxic, clearing away heat and fever, and has the effect of promoting fluid production and quenching thirst. Chinese medicine uses gypsum soup to treat diseases. Calcium sulfate can remove oxides from jewelry. So you won't worry about the lack of bright jewelry.
Pay attention to some things at ordinary times. When swimming, gold jewelry should be taken off to avoid chemical changes on the surface after contact with seawater or pool water, which will lead to the loss of luster and color of jewelry. Pure gold jewelry will react with mercury and appear white spots. After cleaning, the original color can be restored as long as it is baked under alcohol lamp for a period of time.
Because chalk contains lime, it can be dehumidified and dried. If there is water, it is easy to oxidize. The surface of jewelry will not turn black. Chalk has a big gap inside, so it should absorb water! This can reduce the possibility of rust!