Vat dyes

(1) Liquid Indigo Blue 30% (Paste)

• The dye is converted into leuco form with caustic soda and sodium hydrosulphite in soft water.
• The dyeing is carried out in the reduced exposed to air. By oxidation the dye slowly changes into blue on the fabric.
• The dyed material has good fastness to light and wash.
• Rubbing fastness is reasonably good.

(2) Vat Indigo blue 94% granular

• It is dark blue in color. It is insoluble in water and organic solvents, i.e., aether and ethanol. But, it is soluble in phthalic anhydride and aniline.
• Its appearance is dark blue uniform granule.
• It is used to dye cotton fiber. Indigo blue is used to make “cowboy” type clothes.
• It can be used to dye white and longitudinal yarn interweaving; it can be used with sulfurated coloring matter.
• It is widely used in food colouring matter as well as biochemistry.

(3) Vat Indigo Blue 60% Grains

• For effortless/ready use, the reduced vat indigo blue 60% grains (above) can be used.