It is widely used for reducing dyeing, reducing cleaning, printing and decolorization in the textile industry, and for bleaching silk, wool, nylon and other fabrics. Because it does not contain heavy metals, the bleached fabric is very bright and not easy to fade. In terms of various substances, it can also be used for food bleaching, such as gelatin, sucrose, preserves, and bleaching of soap, animal (plant) oil, bamboo, porcelain soil, etc. It can also be used as a reducing agent or bleach in the production of dyes and drugs, and sodium hydrosulfite is the most suitable bleach for wood pulp and paper.