Home > Products > Indigo Dye

Indigo Dye with Wide Application Area

Indigo dye is an organic compound with a distinctive blue color. Historically, indigo is a kind of blue pigment extracted from plants named Indigofera grew in the British Islands. So the color indigo is named after the plant indigo. Indigo dye has been used for thousands of years all over the world. It has been the most outstanding and most extensively used natural dye throughout history and is still extremely popular today. But nearly all indigo dye produced today (several thousand tons each year) is synthetic based on chemical methods. The familiar color of blue jeans is the best evidence. There are many people wearing jeans in modern society, including men, women, children and the old. Therefore, the amount of indigo dye used is larger than the past.

The structural formula of indigo dye.

The structural formula shows the properties of indigo dye clearly.

A heap of blue powder in white background.

Indigo dye can give a blue tone, making the world more colorful.


  • Molecular formula: C16H10N2O2.
  • Relative molecular weight: 262.27 (according to the international molecular weight of 1983).
  • Appearance: Dark blue granular or powder.
  • Purity: Above 93%.
  • Strength: Above 80%.
  • PH Range: 9.5 - 10.5.
  • Moisture content: ≤1.0%.
  • Content of ferric ions: ≤200ppm.

Packaging detail:

  • 25kg/bag, outside is plastic woven bag, inside with plastic-coating bag.
  • 20kg carton with wood pallet. Loading quantity: 9 tons in 1FCL, 20 feet.
  • 15/20/25kg per iron drum.
  • Packed as customers' requirement.

The appearance of indigo is dark blue granular or powder. It cannot be dissolved in water and common organic solvents, such as ethanol and aether, but it is soluble in hot aniline. Its melting point in the closed environment is 390~392℃, and it begins sublimating slowly at 290℃. It is dark blue when meets concentrated sulfuric acid, and blue after attenuation. Its aqueous solution turns green to yellow-green when added into sodium hydroxide.


  • Free of dust or little flying dust. The granules have certain mechanical strength, and they do not create dust easily. So the feature can improve the working environment and sanitary condition.
  • Good flowability, which is helpful to the automatic measuring and operation.
  • Good wettability and dispersibility. It will not agglomerate or aggregate in the process on use, and is convenient for preparing dye liquor.
  • Good storage stability. It will not absorb moisture easily, and there isn't electrostatic adsorption phenomenon.
  • It will not be harmful to environment.
  • It can also guarantee the homogenic and brilliant color in printing and dyeing.


  • About 20 million kg synthetic indigo dyes are produced every year, and mainly used for blue jeans.
  • Small amounts of indigo are used for dyeing wool, silk and leather.
  • It is also used as food colorant to make food more colorful and beautiful.
  • Besides, it is used in makeups to make people more fashionable and confident.
A pair of jeans in white background, with the trouser legs held.

Jeans dyed with indigo make persons who wear them look thinner.

A dress with blue-and-white strip.

Indigo dye makes the dress more beautiful, so it will sell well.

A corner of cake with blue and white alternated, and a blue pattern on the top.

Cake with indigo dye looks more delicious.

Five finger nails put together with indigo dyed.

Indigo dyeing on finger nails makes people look noble and elegant.

Inquiry for Our Product

Anping County Wuxin Chemical Dyes Co., Ltd.
E-mail: sales@indigodye.org

When you contact us, please provide your detail requirements.
That will help us give you a valid quotation.