The invention also relates to disazo dyestuffs which may be regarded as 2 molecules of the dyestuffs of formula '(2) joined together through the radical A by a direct link or a bridging atom or group such as O-, S, Nl-I, CH=CH, OCH CH O-, -CONH- or NHCONH. When the radical A contains a metallizable group, for example a hydroxy or carboxylic acid group, in ortho position to the azo group, then such