| abstract |
Doubled copper formazan reactive dyes of the formula in the R¹ is hydrogen, hydroxysulfonyl or chlorine, R² is hydrogen or hydroxysulfonyl, one of the two radicals R³ and R⁴ is hydrogen and the other hydroxysulfonyl Q fluorine or chlorine and X is a radical of the formula mean, where R⁵, R⁶ and Y each have the meaning given in the description, and their salts, and the use of these dyes for dyeing and printing hydroxyl groups or nitrogen-containing organic substrates. |