14## the azo group being bonded to the radicals K3 and K4 in the formulae in each case in the position adjacent to the hydroxy group, or two moles of their heavy metal complex compounds in which R1 is a hydroxy group, preferably the 1:1 copper complex compounds, or 1 mole of these heavy metal complex compounds of the formula (4) or (5) and 1 mole of the metal-free compound of the formula (5) or, r