1. A PROCESS FOR IMPROVING DYEINGS OF DYESTUFFS SELECTED FROM THE CLASS CONSISTING OF METALLISABLE DYESTUFFS OF THE MONOAZO- AND ANTHRAQUIONE SERIES ON STEREOREGULAR POLYPROPYLENE FIBRES CONTAINING METAL COMPOUNDS SELECTED FROM THE CLASS CONSISTING OF ZINC, CALCIUM, MAGNESIUM AND ALUMINUM SALTS OF EIGHT TO EIGHTEEN CARBON ATOM CARBOXYLIC ACIDS WHICH COMPRISES IMMERSING SAID DYEINGS IN AN AQUEOUS DISPERSION OF A METAL COMPLEX SELECTED FROM THE CLASS CONSISTING OF CHROMIUM, COBALT, NICKEL AND COPPER COMPLEXES AND CHELATING AGENTS, WHICH CHELATING AGENTS YIELD ZINC COMPLEXES HAVING STABILITY CONSTANTS OF AT LEAST 4.0 AND AT MOST 12.0, AT A TEMPERATURE BETWEEN 70* AND 120*C.