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Indigo is powder blue (probably dark blue), odorless., whose molecular formula is C16H10N2O2, is a water-soluble non-azo colorant. Indigo blue is slightly soluble in water, ethanol, glycerol and Propylene Glycol, insoluble in oil. Indigo pigment is one of the oldest pigments known to mankind, which is widely used in food, medicine and printing and dyeing industries.

Indigo blue is easy to color, has a unique tone and is widely used. Heat resistance, light resistance, alkali resistance, oxidation resistance, salt resistance and bacterial resistance are all poor. Indigo is mainly used for dyeing cotton yarn, cotton cloth, wool or silk. This pigment is an important pigmenting product of vat dye Indigo, which has excellent light resistance, weather fastness and heat stability, gives a blue tone, and can be prepared into liquid dispersion dosage form, which is mainly used for dyeing and printing viscose fiber puree. Used for biochemical reagents and indicators, and dyeing of cotton yarn, cotton cloth, wool or silk. In the food industry, indigo is used as food pigment in the form of its sodium sulfonate or its aluminized form.