Diketopyrrolopyrroles of the formula (I): ##STR1##

wherein

  • R1, R2, R3 and R4 independently of one another are a C1-C4 alkyl radical or a substituted or unsubstituted phenyl radical, wherein the phenyl radical can be substituted by 1, 2, 3 or 4 substituents from the group C1-C4 alkyl, C1-C4 alkoxy, CN, F, Cl, Br, NO2, CF3, S—C1-C4 alkyl, phenyl or (C1-C2)alkylenephenyl,

    with the proviso that at least one of the radicals, R1, R2, R3, or R4, is one of the stated substituted or unsubstituted phenyl radicals.

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