NOVELTY - A high-electrical-insulation azo black pigment has molecular structure comprising 1 or more azo groups in a molecule, and at least one 2-hydroxy-11H-benzo(a)-carbazole-3-carboxylic acid amide residue introduced from coupling component. The volume resistivity of azo black pigment is 1010 Omega .cm or more and average particle diameter of 10-200 nm.    USE - High-electrical-insulation azo black pigment is used for coating material, coating agent, plastic material, fiber, printing ink, stationery material, image-recording material, image display component, coloring of article, color display panel, manufacturing back sheet of solar power generation module (all claimed) for organic electroluminescent display device, liquid-crystal panel, pavement of road, deck of boats and ships, camouflage of army equipment, conductive wire, electrical circuit and forgery prevention material.    ADVANTAGE - The azo black pigment having excellent high electrical-insulation property, visible-light optical characteristics, and infrared-ray permeability is economically manufactured, by simple method.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) manufacture of azo black pigment having average particle diameter of 10-200 nm, which involves preparing azo black pigment having molecular structure chosen from structure of formula: Ar'-N=N-HBC (I) obtained by azo coupling of 2-hydroxy-11H-benzo(a)-carbazole-3-carboxylic acid-arylamide (HBC) to diazonium salt formed by diazotizing diazo component of formula: Ar'-NH2 (Ia) having one amino group, structure of formula: HBC-N=N-Ar'-N=N-HBC (II) obtained by azo coupling of 2-hydroxy-11H-benzo(a)-carbazole-3-carboxylic acid-arylamide to diazonium salt formed by diazotizing diazo component of formula: H2N-Ar'-NH2 (Ib) having 2 or more amino groups, structure of formula: HBC-N=N-Ar'-N=N-Cp (III) obtained by azo coupling of coupling component (Cp) other than the 2-hydroxy-11H-benzo(a)-carbazole-3-carboxylic acid-arylamide to diazonium salt formed by diazotizing diazo component of formula: H2N-Ar'-NH2 (Ic) having 2 or more amino groups, structure of formula: Ar'-N=N-HBC-HBC-N=N-Ar' (IV) obtained by azo coupling of 2-hydroxy-11H-benzo(a)-carbazole-3-carboxylic acid-arylamide to diazonium salt formed by diazotizing diazo component (Ia) having one amino group, structure of formula: Ar'-N=N-HBC-Cp-N=N-Ar' (V) obtained by azo coupling of coupling component (Cp) other than the 2-hydroxy-11H-benzo(a)-carbazole-3-carboxylic acid-arylamide to diazonium salt formed by diazotizing diazo component (Ia) having one amino group, and structure of formula: Ar'-N=N-Ar'-N=N-HBC (VI) obtained by azo coupling of 2-hydroxy-11H-benzo(a)-carbazole-3-carboxylic acid-arylamide to diazonium salt formed by diazotizing diazo component of formula: Ar'-N=N-Ar'-NH2 (Id) having 1 or more azo group and 1 or more amino group, refining azo black pigment, and kneading water-soluble salt, water-soluble organic solvent and azo black pigment;    (2) coloring composition, which contains pigment component comprising azo black pigment obtained by dispersing azo black pigment in liquid dispersion medium or solid dispersion medium;    (3) coloring method of article;    (4) coloring article;    (5) color display panel;    (6) manufacture of back sheet of solar power generation module; and    (7) back sheet of solar power generation module.    Ar'=not defined.    N.B: Ar' is not defined.