g X and X respectively, in ortho-position to its respective N:N bridge, B and B each represent the radical of a benzene, naphthalene, pyrazole or acetoacetylarylamide coupling component, bearing Y and Y respectively, in orthoposition to the N=N bridge, X and X each represent O-, COO or NSO R wherein R is an alkyl or aryl radical, Y and Y each represent preferably --O or they represent NR wherein R