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Thiourea dioxide, an oxidation product of thiourea, is a reducing agent which is stable both in solid form and in cold aqueous solution. It has a slight acidic reaction, and acquires full reducing power only when heated in aqueous solution to about 100°C. This paper briefly describes the chemistry of thiourea dioxide, and dealB with it as a reducing agent for vat dyes in the direct and discharge printing of cellulose acetate, silk, and wool. Owing to its acidic properties, these fibres can be printed with a minimum of degradation and great safety of production. The new reducing agent has been tried on a practical scale, and results of trials are demonstrated.

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