Raw lacquer, commonly known as "earth lacquer", also known as "national lacquer" or "lacquer", is a milky pure natural liquid coating cut from lacquer trees. After contact with air, it gradually turns brown, the surface is dry, and it hardens in about 4 hours to form a paint film. Raw lacquer has high economic value, corrosion resistance, wear resistance, acid resistance, solvent resistance, heat resistance, water resistance and good insulation. It is a high-quality coating for military industry, industrial equipment, agricultural machinery, infrastructure, handicrafts and high-end furniture. It is also one of the important materials traditionally exported by China, which is famous for its quality and quantity.