Title: Disazo dyestuffs

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Abstract: Disazo dyestuffs of the formula: ##SPC1## Wherein B represents a 1,4-phenylene radical which may be substituted by CH.sub.3, OCH.sub.3, NHCOCH.sub.3 or NHCONH.sub.2 or a 1,4-naphthylene radical which may be substituted by OCH.sub.3 or SO.sub.3 H, and Z represents NH.sub.2 or OCH.sub.3, and their manufacture by conventional condensation methods. These dyes are brown cellulose-reactive dyes, (including bluish-brown, orange-brown and reddish-brown shades) which exhaust well on to the fibre from saline dyebaths with high fixation of the absorbed dye, so that deep shades of high tinctorial strength can be obtained; the resulting shades have excellent fastness to light and to washing tests, in which latter there is a remarkably low level of staining, and above all, excellent fastness to bleach treatments.


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