Metal azo pigments

Metal azo pigments comprising:

• a) at least three metal azo compounds which differ at least in the type of metal and which each contain:
• structural units of the formula (I), or the tautomeric forms thereof,
• in which
• R1 and R2 are each independently OH, NH2 or NHR5,
• R3 and R4 are each independently ═O or ═NR5, and
• R5 is hydrogen or alkyl, and
• Ni2+ and Cu2+ ions and at least one further metal ion Me, where:
• Me is a di- or trivalent metal ion selected from the group consisting of La3+, Ce3+, Pr3+, Nd2+, Nd3+, Sm2+, Sm3+, Eu2+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+, Yb2+, Yb3+, Er3+, Tm3+, Mg2+, Ca2+, Sr2+, Mn2+, Y3+, Sc3+, Ti2+, Ti3+, Nb3+, Mo2+, Mo3+, V2+, V3+, Zr2+, Zr3+, Cd2+, Cr3+, Pb2+ and Ba2+,
• the amount of Cu2+ and Ni2+ ions together is 70 to 99.5 mol % and the amount of metal ions Me is 30 to 0.5 mol %, based in each case on one mole of all metal ions in the metal azo pigment, and
• the molar ratio of Cu2+ to Ni2+ ions in the metal azo pigment is 42:1 to 1:42, and
• b) at least one compound of the formula (II)
• in which R6 is hydrogen or alkyl.