TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The nanoscale pigment particle composition further comprises a surfactant comprising derivatives of rosin natural products, long-chain or branched hydrocarbon alcohols, alcohol ethoxylates, acrylic-based polymers, styrene-based copolymers, copolymers of alpha -olefins, copolymers of vinyl pyridine, vinyl imidazole or vinyl pyrrolidinone, polyester copolymers, polyamide copolymers or copolymers of acetals or acetates. Preferred Components: The nanoscale pigment particles have an average particle diameter as derived from transmission electron microscopy imaging is of less than 150 nm. The benzimidazolone pigment comprises a diazo component group and a nucleophilic coupling component group that are linked together with at least one azo group, where the at least one of the diazo component group and the nucleophilic coupling component group comprises a benzimidazolone moiety. The diazo component group is substituted phenyl moiety of formula (a1), substituted 4-(4-oxo-(1,3,5)triazin-2-ylamino)phenyl moiety of formula (a2), substituted 4-(4-oxo-(1,3,5)triazin-2-ylamino)phenyl moiety of formula (a3), substituted naphthalen-1-yl moiety of formula (a4), 2-oxo-benzimidazol-5-substituted-6-yl moiety of formula (a5), substituted phenyl moiety of formula (a6) or substituted phenyl moiety of formula (a7). The nucleophilic coupling component is (acetyl) (2-oxo-2,3-dihydro-1H-benzoimidazol-5-ylaminocarbonyl)methyl moiety of formula (b1) or substituted 3-hydroxy-(2-oxo-2,3-dihydro-1H-benzoimidazol-5-ylaminocarbonyl)-naphthalen-4-yl moiety of formula (b2). The sterically bulky stabilizer is non-covalently associated with the benzimidazolone pigment predominantly by at least one of the intra-molecular or inter-molecular hydrogen bonding, aromatic pi-stacking or van der Waals forces. The sterically bulky stabilizer is an alkylated derivative of an aromatic acid, which is substituted benzene compounds of formula (c1) (preferably 174 e.g. 2,3-bis-octadecylcarbamoyl-benzoic acid, 3,5-bis-(decyl-dodecyl-carbamoyl)-benzoic acid, 3,5-bis-(3-(2-octyl-dodecyloxy)-propylcarbamoyl)-benzoic acid, 3,5-bis-(3-(5,7,7-trimethyl-2-(1,3,3-trimethyl-butyl)-octyloxy)-propylcarbamoyl)-benzoic acid, 3,5-bis-nonadecylidenehydrazinocarbonyl-benzoic acid, benzene-1,3,5-tricarboxylic acid 1,3-dioctadecyl ester, benzene-1,3,5-tricarboxylic acid 1,3-bis-(2-octyl-dodecyl) ester, benzene-1,3,5-tricarboxylic acid 1,3-bis-(2-(2-butoxy-propoxy)-propyl) ester, benzene-1,3,5-tricarboxylic acid 1,3-bis-(2-butoxy-propyl) ester and benzene-1,3,5-tricarboxylic acid 1,3-bis-(2-(2-(2-(2-butoxy-propoxy)-propoxy)-propoxy)-propyl) ester), 1,3,5-tri-substituted benzene compounds of formula (c2), 1,3,5-tri-substituted compounds of formula (c3), 1,2,4-tri-substituted benzene compounds of formula (c4), 1,2,4-tri-substituted benzene compounds of formula (c5), substituted isoindole-1,3-dione-5-yl compounds of formula (c6) (preferably 22 e.g. 5,7,7-trimethyl-2-(1,3,3-trimethyl-butyl)-octanoic acid (1,3-dioxo-2,3-dihydro-1H-isoindol-5-yl)-amide, 1-(1,3-dioxo-2,3-dihydro-1H-isoindol-5-yl)-3-octadecyl-urea, (1,3-dioxo-2,3-dihydro-1H-isoindol-5-yl)-carbamic acid octadecyl ester, octadecyl-carbamic acid 1,3-dioxo-2,3-dihydro-1H-isoindol-5-yl ester and 5-octadecylamino-isoindole-1,3-dione) or substituted benzene compounds of formula (c7) (preferably 42 e.g. 5-(17-((3,5-dicarboxyphenyl)carbamoyl)-9,10-dinonylheptadecanamido)benzene-1,3-dicarboxylic acid, 5-((18-(3,5-dicarboxyphenoxy)-9,10-dinonyl-18-oxooctadecanoyl)oxy)benzene-1,3-dicarboxylic acid, 5-(((10-(8-((3,5-dicarboxyphenyl)carbonyloxy)octyl)-9-nonylnonadecyl)oxy)carbonyl)benzene-1,3-dicarboxylic acid, 5-(((10-(8-((3,5-dicarboxyphenyl)carbonyloxy)octyl)-9-nonylnonadecyl)oxy)carbonyl)benzene-1,3-dicarboxylic acid and 5-(((10-(8-(((3,5-dicarboxyphenyl)carbamoyl)amino)octyl)-9-undecylhenicosyl)carbamoyl)amino)benzene-1,3-dicarboxylic acid). The sterically bulky group is amphiphilic. The sterically bulky group comprises a functional group, which is -COOR, -NHCOR, -OR, -CONHR, substituted alkyl moiety of formula (-(CH2)sCH3), 2,2-dialkyl-substituted ethyl moiety of formula -(CH2CH(CH2)sCH3)(CH2)tCH3), 3-(2,2-dialkyl-substituted ethoxy)-propyl moiety of formula -(CH2)3OCH2CH((CH2)sCH3)((CH2)tCH3)), 2,2,4,8,10,10-hexamethyl-undecan-7-yl or 4,12-dimethyl-pentadecan-7-yl moiety. The nanoscale pigment particles have an aspect ratio of 1:1-7:1. The nanoscale pigment particles have a shape of rods, platelets, needles, prisms or substantially spherical.a = attachment to -NH2 in the pigment precursor or attachment to the -N=N- in the pigment structure;R1-R8 = H, halo, (CH2)oCH3, OH, OR1a, COOH, CO2CH3, CO2(CH2)nCH3, CONH2, (CO)R2a, OCH3 -OCH2CH2OH, NO2, SO3H, 4-carboxamido-benzene-aminocarbonyl moiety of formula (d1), 2-(aminophenoxy)ethoxy moiety of formula (d2), (4-benzoic acid)-aminocarbonyl moiety of formula (d3) or (4-benzene-sulfonic acid)-aminocarbonyl moiety of formula (d4);R1a = H, (CH2)nCH3 or C6H5;o = 0-5;R2a = H, C6H5, (CH2)pCH3 or (CH2)qN(CH3)2;p = 0-12;n, q = 1-6;A = -(CH2)n-, -(O-(CH2)-O)-, -(O-CH2(CHR14)n)-, -(C=O)-, O, S, -CH2o-(C=O)- or -(C=O)-(CH2)o;R14 = H or CH3;R9-R13 = H, halo or OCH3;b = attachment to the azo group;R3a-R8a = H, -NH-(C=O)-R1a, -(C=O)-NH-R1a, -NH-R1a, -NH-(C=O)-NH-R1a, -NH-(C=O)-O-R1a, O-(C=O)-NH-R1a, -(C=O)-O-R1a or -O-(C=O)-R1a, alkyleneoxy or -OR1aa;R1aa = alkyl or cycloaliphatic which contain heteroatoms within the alkyl groups;R = 1-100C cyclic alkyl;s = 0-49;t = s or s+u;u = 1-10;Ry1 = -(CH2)r, -X-(CH2)rX, -((XCH2CH2)r)X-, -((C=O)-(CH2)r-(C=O))-, -X-(C=O)-(CH2)r-(C=O))-X-, -X-((C=O)-X-(CH2)r-X-(C=O))-X-, -((C=O)-X-(CH2)r-X-(C=O))-, 1,20-heteroatom containing (2,19-dioxo-10,11-dinonyl-icosan-1,20-diyl) moiety of formula (-X-C(=O)-(CH2)7CH(CH9)CH(CH9)(CH2)7-(C(=O)-X-), 2,21-heteroatom containing (1,22-dioxo-11,12-dinonyl-docosan-1,22-diyl) moiety of formula (-C(=O)-X-(CH2)8CH(CH9)CH(CH9)(CH2)8-X-(C(=O)-) or 1,3,22,24-heteroatom containing (2,23-dioxo-12,13-dinonyl-tetracosan-1,24-diyl) moiety of formula (-X-C(=O)-X-(CH2)8CH(CH9)CH(CH9)(CH2)8-X-(C(=O)-X-);b = attachment to azo group; andX = O, S or NH.Provided that at least one of R3a-R8a is COOH, CONH2, H or a sterically bulky group, (where the sterically bulky group comprises a functional linker which is -(CH2)r, -X-(CH2)rX, -((XCH2CH2)r)X-, -((C=O)-(CH2)r-(C=O))-, -X-(C=O)-(CH2)r-(C=O))-X-, -X-((C=O)-X-(CH2)r-X-(C=O))-X- or -((C=O)-X-(CH2)r-X-(C=O))- and r is 1-50. EXAMPLE - In a vessel, anthranilic acid (1.86 g), deionized water (25 ml) and hydrochloric acid (6.5 ml of 5M ) were mixed with a magnetic stirrer. The clear solution was cooled to 0 degrees C before ice cold aqueous sodium nitrate (1 ml, 6M) was added at a rate to maintain an internal temperature of 0 degrees C. This solution was then stirred for at least 30 minutes at 0 degrees C to give cold diazo solution. A vessel was charged with deionized water (100 ml) and with vigorous stirring a solution of 3,5-bis(2'-decyltetradecanamidobenzoic acid) (0.5 g) was added, followed by slow dropwise addition of a solution of sodium hydroxide (10.5 ml, 5M) and glacial acetic acid (5.5 ml) to give a homogeneous suspension of finely dispersed white solid. The cold diazo solution was added dropwise to a vigorously stirred acidic suspension of the coupling component, which produces a yellow pigment slurry. After stirring overnight, the solid was collected by suction filtration. The wet cake was reslurried twice in fresh water and vacuum-filtered each time before freeze-drying to give the nanoparticles (4.93 g, 95% yield).