... 90% 2>Printing&dyeing 3>Used as bleaching&antioxidant agent, etc. 4>Our regular exporting produc Product: Sodium ... dyeing industry, can be used as a reducing agent for vat dyes, disperse dyes can be used ... food bleaching agent, the depositary agent, antioxidant agents, preservation agents, bleaching of paper, industrial bleaching agent, processing, reducing agent, sulfonating agent.Packing: ...