disodium 5-bromo-2-[9-chloro-3-(sulphonatooxy)naphtho[1,2-b]thien-2-yl]-1H-indol-3-yl sulphate

(a) in the presence of Pyridine , with Chlorosulfonic acid treatment C.I. Vat Black 1 leuco; (b) in the Pyridine with metal (such as copper, iron, zinc, etc) and Sulfur trioxide source (such as Sulfur trioxide, Chlorosulfonic acid or Methyl chlorosulfonate, etc.) processing C.I. Vat Black 1. The above two kinds of situation after alkaline, filter out insolubles, remove Pyridine and salting out.

blue light grey to blue black. Light brown to gray powder. Soluble in water, its aqueous solution for light yellow, also can soluble in organic solvent. Mainly used for the printing of the cotton fabric, can direct printing and discharge printing, discharge printing is suitable for white discharge printing, also can to a variety of fiber dyeing. Dyeing silk, wool, viscose, vinegar, such as fiber fabric, also can undertake polyester/cotton blended fabric printing.

Standard	Ironing Fastness	Chlorine bleach	Light Fastness	Mercerized	Oxygen bleach	Soaping
						Fading	Stain
ISO	4-5	5	6-7	4-5	4	4-5	5
AATCC	4	5	7		4