The compound, process for preparing a dye liquid dye composition, a process for preparing a composition, process of dyeing paper and leather, paper or leather dyed and mixed dyes

摘要

Black trisazo dyes for cellulosic textiles, leather and especially paper having the structurewhere A isone of B, and B₂ is hydrogen and the other is -SO₃M or a mixture thereof, and M is hydrogen, sodium, potassium, lithium or -HNR₁R₂R₃ wherein R₁ R₂ and R₃ represent the same or differentsubstituents selected from hydrogen, lower alkyl and lower hydroxyalkyl, and stable liquid concentrates of these dyes are described.