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Sodium hydrosulfite, also chemically abbreviated as Na2S2O4, is a chemical that is often used as a reducing agent. The substance often occurs in the form of white to slightly yellowish crystals.
Sodium hydrosulfite is used in various industrial applications including:
Bleaching Paper: It is used as a bleaching agent for paper and pulp.
Textile industry: In textile processing, sodium hydrosulfite is used as a reducing agent to remove dyes.
Food industry: It can be used as a food preservative to maintain freshness.
Photography: Historically it has been used in photographic processing as a reducing agent.
Water Treatment: Sodium hydrosulfite can also be used to dechlorinate water.

Synonyms:

• Sodium Hydrosulphite