Indigo is a deep and rich color that lives between blue and violet. The color indigo represents tranquility but also mystery. Indigo color is also sometimes used to represent harmony and intuition. Like a shroud over the night sky, it is absolute.
The color indigo has the calmness of blue and the kinetic energy of red. These qualities promote concentration, introspection, and a degree of mystique.
Indigo (indigofera tinctoria) was cultivated in East Asia, Egypt, India, and — halfway around the world — Peru. Indigo was used to create a dependable dye that was used to create lasting, rich shades between blue and violet. Indigo was exported from India to Europe, which is how the plant gained the name “indigo” in English.
Indigo was used to make blue dye and became a popular export from India to Europe. Starting in the colonialism era of Europe, indigo became frequently used as a substitute for blue, which was the most expensive pigment through the Middle Ages and the Renaissance. Indigo was also used in the Vatican as part of cardinal purple. Textiles were dyed indigo and then layered with red to create a purple hue.
It was the mid-1600s when a young Isaac Newton pierced a prism with a beam of light. The light sent through the prism cast a rainbow strip on the wall. Newton identified seven base colors in that rainbow, and indigo was the final and deepest one. For centuries, this classification was used throughout science. Modern optics divide the spectrum into blue and violet instead and no longer include indigo.
The colonial history in India and Latin America meant that indigo was cultivated and exported around the world. Indigo played a particularly big role in the exportations of Guatemala. From there, it arrived in the American colonies, where indigo was turned into a cash crop. Leading up to the Revolutionary War, indigo accounted for one-third of the exports from the American colonies.
The French Army adopted indigo as the principal color of its uniforms around the French Revolution. In 1804, however, Napoleon tried to readopt white coats after a British blockade blocked the importation of indigo. The indigo color coats were so much more practical for the army, though, that indigo remained the color of the French military until the early 1900s. Napoleon used 150 tons of indigo per year to continue to dye the uniforms.
Indigo was a readily available alternative to rich royal blue and it took on new meanings after mass production was made possible. So-called “blue-collar” workers wore collars that were dyed with indigo so they wouldn’t show dirt as quickly. In China, the color indigo in the famed Mao suit associated indigo with workers in another way. Then, the first blue jeans — dyed with indigo — forever tied indigo color to the workforce.
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Sulphur Black
1.Name: sulphur black; Sulfur Black; Sulphur Black 1;
2.Structure formula:
3.Molecule formula: C6H4N2O5
4.CAS No.: 1326-82-5
5.HS code: 32041911
6.Product specification:Appearance:black phosphorus flakes; black liquid
Bromo Indigo; Vat Bromo-Indigo; C.I.Vat Blue 5
1.Name: Bromo indigo; Vat bromo-indigo; C.I.Vat blue 5;
2.Structure formula:
3.Molecule formula: C16H6Br4N2O2
4.CAS No.: 2475-31-2
5.HS code: 3204151000 6.Major usage and instruction: Be mainly used to dye cotton fabrics.
Indigo Blue Vat Blue
1.Name: indigo blue,vat blue 1,
2.Structure formula:
3.Molecule formula: C16H10N2O2
4.. CAS No.: 482-89-3
5.Molecule weight: 262.62
6.HS code: 3204151000
7.Major usage and instruction: Be mainly used to dye cotton fabrics.