It is moisture-proof, just like the desiccant in chewing gum. Mainly to keep dry, if there is moisture, it is easy to be oxidized, and the surface of jewelry will be black. The production of jewelry boxes is based on the invention of jewelry, with various internal structures to prevent unnecessary scratches caused by contact between jewelry. The main function of jewelry box is to keep the lasting appearance of jewelry and prevent the dust and particles in the air from corroding and wearing the jewelry surface. Chalk contains lime, which can remove water and dry.

Jewelry has a broad sense and a narrow sense. Jewelry in a narrow sense refers to jade products. Jewelry in a broad sense should include gold, silver and natural materials (minerals, rocks, organisms, etc. ). Collectively referred to as jewelry, handicrafts or other collectibles with certain value. For jewelry, there is a saying of "gold and silver jewelry" in ancient times, which can distinguish gold and silver from jewelry. Chalk absorbs moisture from the air, so jewelry will not react with moisture in the air.

Chalk absorbs water well. Because chalk is made of lime, it absorbs water very well. When ink or water splashes on the table, you can directly dilute the water with chalk, so that there is no ink or water on the table. Chalk is a widely used tool in daily life, and is usually used to write on the blackboard. Ancient chalk was usually made of natural chalk, but today it has been replaced by other substances.

The composition of chalk is white calcium sulfate precipitation, which is not easy to decompose, and the particles are larger than dust. At present, household chalk is mainly composed of ordinary chalk and dust-free chalk. The main components are calcium carbonate and calcium sulfate, or a small amount of calcium oxide.