Vat Blue 1(TDS)

Application and parameters of Vat Blue 1

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Vat Blue 1

Indigo blue
Vat Indigo

CAS NO: 482-89-3

CI.NO: 73000

Molecular Formula: C16H10N2O2
Molecular Weight: 262.26
Shade: Navy blue to red navy

Vat Blue 1 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 temperatuer (℃)

Reduction method

Reduction temperature (℃)

Leveling Property

other Properties



Dry Cylinder



Very low affinity

Colour Fastness Test

light fastness





Bleaching  resistant


standard depth



orginal color changed

white fabric stained

orginal color changed

white fabric stained





chlorine bleaching

Oxygen bleaching

orginal color changed

white fabric stained










Vat Blue 1 (Indigo blue)  is blue powder. It is insoluble in water and alcohol; soluble in aniline solution (hot). It is yellow green in concentrated sulfuric acid, blue precipitate after dilution. Red yellow blush is formed in concentrated nitric acid. Heating to 170 ° C into a purple-red gas, sublimation phenomenon, but does not decompose; in the enclosure, dry distillation, decomposition into aniline. The leuco body formed by the dye in the alkaline powder solution is light yellow, in the acid insurance powder solution white.

C.I. Pigment Blue 66 and the same chemical structure.

Vat Blue 1 Usage:

1. Vat Blue 1(Indigo blue) is mainly used for dyeing cotton yarn or cotton cloth, such as soil cloth, flower cloth, wool blue cloth in rural and remote minority areas, as well as cloth for denim clothing popular at home and abroad. Most of them are dyed by indigo and then interwoven with white yarn. Indigo is used for dyeing cotton yarn or cotton cloth. According to the reducing agent and alkali agent used, there are four kinds of fermentation method, insurance powder method, zinc powder lime method and ferrous sulfate method. Currently, the insurance powder method is commonly used.

2. When indigo blue is dyed by the insurance powder method, it is reduced by dry cylinder, the reduction temperature is 50~60°C, and the dry cylinder stabilization time is 30min.

3. Indigo leuco body has very low affinity for cotton fiber, generally low temperature dyeing. Because low temperature dyeing dye is not easy to penetrate, the concentration of dyeing liquid is too high, which will cause a lot of floating color, so that the dye is not resistant to friction, so multiple times of dip dyeing is used. For each dipping, it needs to be oxidized and then do the second dipping. If it is light, it needs to be dyed two or three times, the middle color is about five times, and the dark color is up to eight or nine times, so the yield is very low. The machine has been widely used in the dyeing of indigo yarn, which greatly improves the production efficiency.


Vat Blue 1  should be stored in a cool, dry, ventilated place, pay attention to fire and moisture.

Vat Blue 1 Application:

Mainly also be used for wool and silk carpets and handicrafts in the application. Pure product is used in food dyes, can also be processed into organic pigments.


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

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