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Indigo BLue (Vat Blue dyes)
Molecular Formula: C16H10N2O2
Colour Index: C.I. Vat Blue 1
Cas No. 482-89-3
Composion: Phenylethane acid potassium salt reacts to amino sodium through alkali fusion,
and then oxidized.
Appearance: Dark blue even Granular and Powder
Particle size(-60 mesh)%: 95%

1. Indigo powder(original powder)
Appearance | Dark blue even powder |
Content (Oxidimetry)% | ≥94 |
Particbe size(-60 mesh)% | ≥96 |
Moisture% | ≤1.0 |
Fe3+ | ≤500ppm |
2. Indigo powder(Diffusion)(W.P.wettable powder)
Appearance | Dark blue even powder |
Content (Oxidimetry)% | ≥93 |
Particbe size(-60 mesh)% | ≥96 |
Moisture% | ≤1.0 |
Fe3+ | ≤300ppm |
3. Indigo(Granular)(W.p.wettable powder)
Appearance | Dark blue even granular |
Content (Oxidimetry)% | ≥93 |
Moisture% | ≤1.0 |
Fe3+ | ≤200ppm |

Item | Standard |
Colour Index | Vat Blue 1 |
Appearance | Dark blue,Powder,Granular |
Colour light | Similar as the standard sample |
Content | ≥93.0%,94.0% |
Moisture content | ≤1.0% |
Strength | Equal to 100 percent of the standard sample |
PH Range | 9.5-10.5 |
Content of ferric ions | ≤200PPM |
Properties | It is insoluble in water and alcohol.It is soluble in hot Aniline |

Use of indigo:
It is mainly used to dye cotton fibre .
The pop "cowboy" clothes mostly are made by indigo blue dying longitudinal yarn and
white yarn interweaving;
It can be used with sulfurated coloring matter;
Also we can get indigo white,bromized indigo blue from it, they are well used in food
coloring matter,biochemistry etc.
Packages of indigo blue:
25KG Plastic-Woven Bag with double polyester liner
20KG Carton with double polyester liner
20KG/15KG Iron Drum with double polyester liner

Storage & Transportation of indigo:
The product must be stored in shade, dry & well-ventilated warehouse.
Avoid to be contacted with oxidizing chemicals and combustible organic substances.
Keep it away from direct sunlight, heat, sparks and open flames.
Carefully handle the product and avoid damaging the package.

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