Sodium hydrosulphite, also known as sodium dithionite (Na2S2O4), has a variety of applications across different industries due to its strong reducing properties. Here are some common uses:
1. **Textile Industry**: Sodium hydrosulphite is widely used as a reducing agent in the dyeing process. It helps in the reduction of indigo dyes and other vat dyes to make them soluble so that they can be absorbed by fibers.
2. **Paper and Pulp Industry**: It is used for the bleaching of paper and pulp. Sodium hydrosulphite effectively removes impurities and brightens the paper by reducing colored organic compounds.
3. **Water Treatment**: It serves as a reducing agent in water treatment processes to remove chlorine, chloramines, and other oxidizing agents from water, ensuring that the water is safe for industrial use or consumption.