| abstract |
A formazan reactive blue dye represented by a free acid of the formula In wherein X 1 and X 2 are each a hydrogen atom, a methyl, methoxy or sulfonic acid group, m and I are each an integer of 0 or 1 and n is an integer of 0 to 2, provided that the sum of m, n and 1 is 2 or 3. n A Proces for their preparation. n This dye is usable for dyeing cellulose fibers in a brilliant blue color with good fastnesses, particularly, chlorine, light and perspiration-light fastnesses, as well as good white dischargeability. n The cellulose fiber dyed by this process. |