Abstract: The invention relates to a pigment composition based on P.Y. 191 of the formula (1) containing 0.05 to 30 mol %, based on the sum of P.Y. 191 and a further yellow colorant, of at least one further yellow colorant of the formula (2) and/or of C.I. Pigment Yellow 100 in which R1, R2, R3 and R4 are each independently hydrogen, halogen, —CH3, —NO2, or NH—R6 where R6 is C1-C4-alkyl; R5 is methyl or carboxyl, and where the compound of the formula (2) is not C.I. Pigment Yellow 191.

Abstract: The invention relates to a pigment composition based on P.Y. 191 of the formula (1) containing 0.05 to 30 mol %, based on the sum of P.Y. 191 and a further yellow colorant, of at least one further yellow colorant of the formula (2) and/or of C.I. Pigment Yellow 100 in which R1, R2, R3 and R4 are each independently hydrogen, halogen, —CH3, —NO2, or NH—R6 where R6 is C1-C4-alkyl; R5 is methyl or carboxyl, and where the compound of the formula (2) is not C.I. Pigment Yellow 191.

Abstract: A mixed crystal of C.I. Pigment Red 170 and one or more of the compounds of the formula (1) wherein X has the definition F, Cl, Br, methyl or nitro. The novel mixed crystals have better light-fastness and weather resistance than unsubstituted C.I. Pigment Red 170.

Abstract: The epindolidione compounds of the general formula (I) in which A?, R2 and A have the meanings given in claim 1, are outstanding pigments which are notable in particular for better migration, light and solvent fastnesses, better heat stability and enhanced colouring power and also better dispersibility and capability to be brought into pigment form. The invention also relates to a process for preparing these epindolidione compounds and to their use a colorants for colouring polymer compositions or paper pulps, as colorants in electrophotographic toners and developers, as colorants in ink-jet inks, as colorants in the coatings industry, as colorants for textile printing or as a printing ink in the graphical industry, as colorants in cosmetics.

Abstract: The epindolidione compounds of the general formula (I) 1

Abstract: The invention relates to a novel crystal modification (&ggr;-modification ) of C.I. Pigment Red 53:2 of the formula (1) having the following characteristic reflections in the X-ray powder diffraction pattern: 2&THgr; d Relative intensity in %  4.4 20.2  49  5.8 15.4  100   8.8 10.0  23 10.3 8.6 25 10.9 8.1 33 12.2 7.3 15 13.9 6.4 16 15.4 5.8 15 16.7 5.3 28 17.6 5.0 16 18.4 4.8 18 18.6 4.8 18 19.7 4.5 20 20.8 4.3 18 23.2 3.8 48 24.0 3.7 21 24.8 3.6 37 25.2 3.5 34 26.6 3.3 19 27.3 3.3 19 27.9 3.2 12 29.3 3.

Abstract: The invention relates to a novel crystal modification (.delta.-modification) of C.I. Pigment Red 53:2 of the formula (1) ##STR1## having the following characteristic reflections in the X-ray powder diffraction pattern:______________________________________ 2.THETA. d relative intensity (in %) ______________________________________ 3.3 26.6 32 4.7 18.7 100 7.5 11.9 14 9.4 9.3 19 10.5 8.4 13 13.8 6.4 10 14.2 6.2 9 14.9 5.9 10 16.7 5.3 11 17.6 5.0 9 18.1 4.9 16 18.9 4.7 10 20.4 4.3 7 21.1 4.2 9 22.1 4.0 9 22.7 3.9 12 23.1 3.8 9 23.6 3.8 13 24.1 3.7 9 24.9 3.6 10 25.5 3.5 23 26.3 3.4 9 27.7 3.2 9 28.1 3.2 6 28.9 3.1 6 30.4 2.