| abstract |
The invention relates to a method for the colouring of leather with at least one dye (F), comprising at least one group of formula (A) which may be activated under alkaline conditions, where ---- represents the bond to the remainder of the dye molecule, X is an electron-withdrawing group, k = 1, 2, or 3, n = 0 or 1 and B is a CH=CH2, or CH2-CH2-Q group, where Q is a group which may be cleaved under alkaline conditions, comprising the treatment of the leather with an aqueous liquor, containing at least one dye (F), at a pH value of at least 7.5. The invention further relates to novel dyes which are particularly suitable for the reactive colouring of leather. |