Metal azo pigments

Metal azo pigments comprising:

• a) at least two 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 NHR3,
• R3 and R4 are each independently ═O or ═NR5,
• R5 is hydrogen or alkyl, and
• Ni2+ metal ions end/or one or more metal ions Me1, and optionally one or more metal ions Me2, where:
• Me1 is a metal ion selected from the group consisting of La3+, Ce3+, Pr3+, Nd2+, Nd3+, Sm2+, Sm3+, Eu2+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+, Yb2+ and Yb3+, and
• Me2 is a metal ion selected from the group consisting of Mg2+, Ca2+, Sr2+, Ba2+, Sc3+, Y3+, Ti2+, Ti3+, Zr2+, Zr3+, V2+, V3+, Nb3+, Cr3+, Mo2+, Mo3+, Mn2+, Fe2+, Fe3+, Co2+, Co3+, Cu2+, Zn2+, Cd2+, Al3+ and Pb2+,
• with the proviso that the amount of Ni2+ metal ions and metal ions from the Me1 group together is 95 to 100 mol % and, if used, the amount of metal ions from the Me2 group is 0 to 5 mol %, based in each case on one mole of all metal ions in the metal azo pigment, and
• where the molar ratio of Ni2+ metal ions to Me1 metal ions in the metal azo pigment is 1:1 to 19:1, and
• b) at least one compound of the formula (II)
• in which R5 is hydrogen or alkyl.