An ink composition comprising: a non-polar carrier, and a nanoscale pigment particle composition, comprising: a benzimidazolone pigment, and a sterically bulky stabilizer compound associated non-covalently with the benzimidazolone pigment, wherein the sterically bulky stabilizer compound comprises a substituted pyridine derivative; wherein the sterically bulky stabilizer is a compound of the formula: wherein R 1 to R 4 can be the same or different and represent H, -NH-(C=O)-R', -(C=O)-NH-R'), -NH-R', -NH-(C=O)-NH-R', -NH-(C=O)-O-R', O-(C=O)-NH-R', -(C=O)-O-R', -O-(C=O)-R', branched or linear alkyleneoxy chains, or -OR', wherein R' is predominantly a linear or branched alkyl or cycloaliphatic group that may contain heteroatoms within the alkyl groups; wherein R y is selected from the group consisting of -(CH 2) n; -X-(CH 2) n X; - [(XCH 2 CH 2) n]X-; -[(C=O)-(CH 2) n -(C=O)]-; -X-[(C=O)-(CH 2) n -(C=O)]-X-; -X-[(C=O)-X-(CH 2) n -X-(C=O)]-X-; -[(C=O)-X-(CH 2) n -X-(C=O)]-, wherein X is defined as O, S, or NH and integer n is 1 to 50; wherein X, X 1 and X 2 are defined as being either O, S, or NH, and X 1 and X 2 may or may not be the same; or wherein the sterically bulky stabilizer is a compound of the formula: where X represents -N - or -O-, and wherein R 1 and R 2 are selected from the group consisting of: wherein the nanoscale pigment particles have an average particle diameter as derived from transmission electron microscopy imaging, of less than 150 nm. a non-polar carrier, and a nanoscale pigment particle composition, comprising: a benzimidazolone pigment, and a sterically bulky stabilizer compound associated non-covalently with the benzimidazolone pigment, wherein the sterically bulky stabilizer compound comprises a substituted pyridine derivative; wherein the sterically bulky stabilizer is a compound of the formula: wherein R 1 to R 4 can be the same or different and represent H, -NH-(C=O)-R', -(C=O)-NH-R'), -NH-R', -NH-(C=O)-NH-R', -NH-(C=O)-O-R', O-(C=O)-NH-R', -(C=O)-O-R', -O-(C=O)-R', branched or linear alkyleneoxy chains, or -OR', wherein R' is predominantly a linear or branched alkyl or cycloaliphatic group that may contain heteroatoms within the alkyl groups; wherein R y is selected from the group consisting of -(CH 2) n; -X-(CH 2) n X; - [(XCH 2 CH 2) n]X-; -[(C=O)-(CH 2) n -(C=O)]-; -X-[(C=O)-(CH 2) n -(C=O)]-X-; -X-[(C=O)-X-(CH 2) n -X-(C=O)]-X-; -[(C=O)-X-(CH 2) n -X-(C=O)]-, wherein X is defined as O, S, or NH and integer n is 1 to 50; wherein X, X 1 and X 2 are defined as being either O, S, or NH, and X 1 and X 2 may or may not be the same; or a benzimidazolone pigment, and a sterically bulky stabilizer compound associated non-covalently with the benzimidazolone pigment, wherein the sterically bulky stabilizer compound comprises a substituted pyridine derivative; wherein the sterically bulky stabilizer is a compound of the formula: wherein R 1 to R 4 can be the same or different and represent H, -NH-(C=O)-R', -(C=O)-NH-R'), -NH-R', -NH-(C=O)-NH-R', -NH-(C=O)-O-R', O-(C=O)-NH-R', -(C=O)-O-R', -O-(C=O)-R', branched or linear alkyleneoxy chains, or -OR', wherein R' is predominantly a linear or branched alkyl or cycloaliphatic group that may contain heteroatoms within the alkyl groups; wherein R y is selected from the group consisting of -(CH 2) n; -X-(CH 2) n X; - [(XCH 2 CH 2) n]X-; -[(C=O)-(CH 2) n -(C=O)]-; -X-[(C=O)-(CH 2) n -(C=O)]-X-; -X-[(C=O)-X-(CH 2) n -X-(C=O)]-X-; -[(C=O)-X-(CH 2) n -X-(C=O)]-, wherein X is defined as O, S, or NH and integer n is 1 to 50; wherein R 1 to R 4 can be the same or different and represent H, -NH-(C=O)-R', -(C=O)-NH-R'), -NH-R', -NH-(C=O)-NH-R', -NH-(C=O)-O-R', O-(C=O)-NH-R', -(C=O)-O-R', -O-(C=O)-R', branched or linear alkyleneoxy chains, or -OR', wherein R' is predominantly a linear or branched alkyl or cycloaliphatic group that may contain heteroatoms within the alkyl groups; wherein R y is selected from the group consisting of -(CH 2) n; -X-(CH 2) n X; - [(XCH 2 CH 2) n]X-; -[(C=O)-(CH 2) n -(C=O)]-; -X-[(C=O)-(CH 2) n -(C=O)]-X-; -X-[(C=O)-X-(CH 2) n -X-(C=O)]-X-; -[(C=O)-X-(CH 2) n -X-(C=O)]-, wherein X is defined as O, S, or NH and integer n is 1 to 50; wherein the sterically bulky stabilizer is a compound of the formula: where X represents -N - or -O-, and wherein R 1 and R 2 are selected from the group consisting of: where X represents -N - or -O-, and wherein R 1 and R 2 are selected from the group consisting of: wherein the nanoscale pigment particles have an average particle diameter as derived from transmission electron microscopy imaging, of less than 150 nm.