The novel dyestuffs of the present invention in which n=nought can also be manufactured, in a manner according to the invention, by subjecting 1 mole of each of the monoazo compounds of the above formulae (4) and (5), which can have the same or different meanings, or 2 moles of their heavy metal complex compounds in which R1 is a hydroxy group, preferably the 1:1 copper complex compounds, or 1 mol