> Color Index Number
C.I. Vat Blue 1
> Structure formula
> Molecular Weight
(according to 2001 Edition of International Molecular Weight)
C H10 O2
> Phisical and Chemical Properties
product is dark blue even granules, able to rapidly disperse in water, soluble
in hot aniline solution. In concentrated sulfuric acid, it appears
yellowish green and after diluted, it produces the blue-colored pecipitate.
When heated to 170 degree C, it begins to sublimate and convers to
purple-colored fume without decomposition. The leuco compound presents
light yellow color after the alkaline reduction.
mainly used for the dyeing of cotton yarn and fabrics. For instance, the
internationally popular Blue Jeans are cross-woven mostly with the indigo-dyed
yarn and while yarn. It can also be used for the dyeing of wool and silk,
therefore, a certain quantity of indigo is consumed in carpet and handicrafts
> Main Specifications
Ionic iron (ppm)
woven plstic bags, or carton boxes sealed with plastic film, inside two plstic,
containing 10 kg product each.
with powdery indigo, the indigo LD has many advantages:
more brillant shade.
higher degree of dyeing
decrease residue amount after reducing
lower ionic iron content.