Vat Blue 5(TDS)

Application and parameters of Vat Blue 5

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Vat Blue 5

Bromo indigo blue
Bromo Indigo
Indigo Blue 4B
Bromo Indigo 2B

CAS NO: 2475-31-2

CI.NO: 73065

Molecular Formula: C16H6Br4N2O2
Molecular Weight: 577.85
Shade: Dark blue powder

Vat Blue 5 Physical and Chemical properties

Dyeing depth g/L


Dyeing method


Leuco color


Leveling property


Dead cotton

Light (Xenon test 1/12)


Light (Xenon test 1/1)


Light (Xenon test 2/1)


Application Features

Dyeing method

Dyeing temperature(℃)

Reduction Method

Reduction temperature (℃)

Leveling Property

Other properties

most suiable for special method ,also can be used B


Dry Cylinder



Not resistant to alkali cooking

Colour Fastness Test

Light fastness





Bleaching resistant






orginal color changed

white fabric stained

orginal color changed

white fabric stained





Chlorine bleaching

oxygen bleaching

orginal color changed

white fabric stained












The appearance of  Vat Blue 5 (bromo indigo blue) is dark blue powder. It is insoluble in water and alcohol; soluble in xylene, tetrahydronaphthalene, nitrobenzene. It is blue-green in concentrated sulfuric acid, blue after dilution and precipitated. Dye in alkaline powder The leuco body formed in the solution is yellow, and the acid insurance powder solution is pale yellow.

Vat Blue 5 Usage:

1. When bromine indigo is used for cotton product dyeing or dip dyeing, it is most suitable to use special method. It can also be used in B method, but it can be dyed without salt. It needs to be reduced by dry cylinder. The drying time of dry cylinder needs 10~15min, temperature 60~ 80 ° C, dry cylinder stabilization time is more than 60min.

2. The bromine indigo leuco body has higher affinity for cotton fiber and good leveling property. The dyeing curve is shown in Figure 4-5-22. The hiding power of dead cotton is very poor. It should not be washed after dyeing, it should be oxidized in air first. Or put directly into the oxidation bath

Oxidation of (hydrogen peroxide or sodium perborate). After oxidation, it is fully scented by soaping. It is mainly used for cotton yarn dyeing and cotton cloth dyeing, and is generally not used for suspension padding.

3. Bromoindigo is one of the important dyes for vat dyes in cotton printing. It is suitable for direct printing, but also for discharge and anti-dye printing.

vat blue 5

Fig4—5—22  Bromo indigo blue staining curve

When the color paste is prepared by the non-pre-reduction method, caustic soda or potassium carbonate is used as the alkali agent, but the color shade is greenish; if the printing paste is prepared by the pre-reduction method, the caustic soda is used as the alkali agent, and heated to 50 ° C, only the white powder is added. Add insurance powder, the color is bright and blue, but the amount of color is not high without pre-reduction method. The printing and dyeing steaming time should not be too long, so as not to affect the normal color development. It is better to use sodium perborate or air to ventilate. When used for printing, in addition to being used as the main color alone, it is often combined with a reduced brown RRD to adjust the color.

4. Bromine indigo is suitable for the dyeing of viscose fiber, and has good leveling property and affinity. It can also be used for the dyeing of cotton blended fabric, but the color of the dye is slightly darker than cotton.

5. The bromine indigo printing and dyeing fabric is finished by BHES resin, and the color light turns green and dark.


1. Vat Blue 5 (Bromo indigo blue) is not resistant to alkali cooking and chlorine bleaching, so it can not be used for color fabrics that require alkali boiling and chlorine bleaching. When dry treatment is encountered after printing, the concentration of bleaching liquid should be properly controlled and kept consistent.

2. When bromine indigo is used for large-area printing, the oxidation color must be sufficient. Immediately after oxidation, it should be soaped to prevent the printed fabric from being colored when it is left in a wet state. Soaping should be carried out at 90~95 °C, otherwise When the finished soap is washed, the fading fastness is poor, the green light is heavy and the color is wilted.

3. Vat Blue 5 should be stored in a dry, ventilated place to avoid moisture.

Vat Blue 5 Application:

Mainly used for cotton of jig dyeing and yarn dyeing, dyeing hair blue cloth color turquoise blue. Is the important dye printing, can direct printing, also can discharge printing and resist printing. Can also be used for viscose, silk and wool dyeing, levelness and affinity are good. Can be processed into organic pigment


20 or 25kg/compound bag, carton box, iron drum, fiber durm for powder dye and 1000kg/tank for liquid dye

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