Vat Orange 4

(a) in Nitrobenzene or Chlorosulfonic acid in the ?8,16-Pyranthrenedione brominated; (b) Bromination of 1-(2-Methyl-9,10-dioxoanthracene-1-yl)-2-methylanthracene-9,10-dione?dehydration.

red light orange. Orange powder. Soluble in 1, 2, 3, 4-Tetrahydronaphthalene, Xylene is yellow, a green fluorescent, insoluble in Etanol. The strong sulfuric acid for blue, orange precipitation after diluted. Alkaline reduction leuco purple, acid reduction is orange leuco. Used for the cotton fabric dyeing as red orange, the direct to cotton good sex. Can be used for the discharge printing and dyeing, also can be used for silk dyeing. Unlike structure C.I. Pigment Red 216

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