b and from containers 14 of said fourth station d and may also receives water from a tank 340 provided with respective outlet conduit 34 connected to the manifold 26 the supply of manifold mixer 26 with liquids exiting from said stations b and d and delivered to corresponding outlet conduits 28 u2014 and with the water from conduit 34 being ensured by corresponding positive displacement pumps 29 to which respective flowmeters 30 are associated according to the embodiment illustrated by way of example in fig1 of the attached drawings the containers 5 of station b wherein the solutions are prepared with the products such as organic acids inorganic bases surfactants softners and or other auxiliary products stored inside tanks 1 of stations a lead to a single conduit 28 for feeding the manifold 26 upstream of the respective pump 29 the contents of containers 5 all flow into a three way valve from which said single conduit 28 branches off the containers 14 of station d wherein the dyeing solution are prepared are disposed in groups of three units so that each group will correspond to a colour and each unit to a preset stregth of the relevant dye the outlet of each of the three tanks 14 of each group of station d exhibits a corresponding shut off valve 37 the outlets of all said valves 37 being connected to the pump 29 of the relevant group provided on the outlet of manifold 26 that is intermediate between the manifold 26 and the machine m is a discharge section.