Abstract: Metal complexes of disazo dyestuffs of the formula ##STR1## wherein one X=chlorine and the other X=NO.sub.2, orboth the radicals X=chlorine, andR=the radical of a diazo component of the benzene, naphthalene or diphenylamine series which, in the o-position relative to the azo group, is free from groups which form metal complexes,and their use for dyeing and printing of nitrogen containing materials, such as silk, wool or synthetic fibers of polyamides or polyurethanes. The resulting dyeings have excellent fastness properties.

Abstract: Iron complexes of azo dyestuffs of the formula ##STR1## wherein R.sub.1 and R.sub.2 have the meaning indicated in the description,and their use for dyeing or printing various fibre materials, for example wool, silk and synthetic materials such as Perlon, but especially leather. The dyeings obtained are distinguished by good fastness properties.

Abstract: The compound which corresponds to the formula ##STR1## is suitable for the preparation of azo dyestuffs.

Abstract: The subject matter of the present invention relates to tetrakisazo dyestuffs which in the acid form correspond to the formula ##STR1## wherein Z.sub.1, Z.sub.2 = an optionally substituted amino groupR = h or a non-ionogenic substituent, in particular halogen or alkyl,n = an integer of 1 to 3The rings A and B possible having further substituents, for example, alkoxy groups, such as methoxy groups, and the substituents R as well as Z.sub.1 and Z.sub.2 being the same or different. The new dyestuffs are suitable for dyeing and printing of natural fiber materials and distinguish themselves by good fastness properties.

Abstract: The subject matter of the present invention relates to tetrakisazo dyestuffs which in the acid form correspond to the formula ##STR1## wherein R = H or substituent,R.sub.1 = h or SO.sub.3 HZ.sub.1, z.sub.2 = an optionally substituted amino group,n = 1 or 2m = 1 or 2, n + m being .ltoreq.3 and wherein the rings A and B may have further substituents, for example, alkoxy groups such as methoxy groups.The new dyestuffs are suitable for the dyeing and printing of natural fibre materials, especially leather, and distinguish themselves by good fastness properties.