A composition comprising a particulate solid, a mid-polar, fatty acid ester medium and/or polar, glycol ether medium and a dispersing agent of the Formula RC(=O) - m - n - Z Formula wherein Formula 1 is a random or blocky copolymer of A and B units, R is a C 1-35 hydrocarbyl group optionally substituted with hydroxyl or halogen; A is an oxy (C 8-20) alk(en)ylene carbonyl repeating unit; B is an oxy (C 2-7) alkylene carbonyl repeating unit; m is 1-6 and n is 1-10 and m + n is from 4 to 16; Z is OH or is a group which is attached to the carbonyl group of A or B through an oxygen or nitrogen atom and is represented by the formula: (i) -O-Q-Y wherein Q is an alkylene or hydroxyalkylene radical containing from 2-6 carbon atoms; and Y is a tertiary amine group represented by the formula: -N (R 2) (R 3) or (ii) -N -Q-Y' or -O-Q-Y' wherein T is a hydrogen, or a C 1-18 hydrocarbyl radical, or a group represented by Q-Y'; Q is as defined above; and Y' is a quaternary ammonium group represented by the formula: -N + (R 2) (R 3) (R 4) W - wherein R 2, R 3 and R 4 are each independently alkyl, cycloalkyl, or benzyl groups wherein the alkyl or cycloalkyl group can have from 1 to 18 carbon atoms, optionally hydroxyl or halogen substituted, and wherein R 2 and R 3 can be a single hydrocarbon group that in combination with the N of the Y group forms a cyclic amine which can be saturated or unsaturated; and W - is a colourless anion, and wherein the particulate solid is a mixed metal oxide pigment that develops its color intensity and hue after firing at elevated temperatures. wherein Formula 1 is a random or blocky copolymer of A and B units, R is a C 1-35 hydrocarbyl group optionally substituted with hydroxyl or halogen; A is an oxy (C 8-20) alk(en)ylene carbonyl repeating unit; B is an oxy (C 2-7) alkylene carbonyl repeating unit; m is 1-6 and n is 1-10 and m + n is from 4 to 16; Z is OH or is a group which is attached to the carbonyl group of A or B through an oxygen or nitrogen atom and is represented by the formula: (i) -O-Q-Y wherein Q is an alkylene or hydroxyalkylene radical containing from 2-6 carbon atoms; and Y is a tertiary amine group represented by the formula: -N (R 2) (R 3) or (ii) -N -Q-Y' or -O-Q-Y' wherein T is a hydrogen, or a C 1-18 hydrocarbyl radical, or a group represented by Q-Y'; Q is as defined above; and Y' is a quaternary ammonium group represented by the formula: -N + (R 2) (R 3) (R 4) W - wherein R 2, R 3 and R 4 are each independently alkyl, cycloalkyl, or benzyl groups wherein the alkyl or cycloalkyl group can have from 1 to 18 carbon atoms, optionally hydroxyl or halogen substituted, and wherein R 2 and R 3 can be a single hydrocarbon group that in combination with the N of the Y group forms a cyclic amine which can be saturated or unsaturated; and W - is a colourless anion, and wherein the particulate solid is a mixed metal oxide pigment that develops its color intensity and hue after firing at elevated temperatures. wherein Q is an alkylene or hydroxyalkylene radical containing from 2-6 carbon atoms; and Y is a tertiary amine group represented by the formula: -N (R 2) (R 3) wherein T is a hydrogen, or a C 1-18 hydrocarbyl radical, or a group represented by Q-Y'; Q is as defined above; and Y' is a quaternary ammonium group represented by the formula: -N + (R 2) (R 3) (R 4) W - wherein R 2, R 3 and R 4 are each independently alkyl, cycloalkyl, or benzyl groups wherein the alkyl or cycloalkyl group can have from 1 to 18 carbon atoms, optionally hydroxyl or halogen substituted, and wherein R 2 and R 3 can be a single hydrocarbon group that in combination with the N of the Y group forms a cyclic amine which can be saturated or unsaturated; and W - is a colourless anion, and wherein the particulate solid is a mixed metal oxide pigment that develops its color intensity and hue after firing at elevated temperatures. wherein R 2, R 3 and R 4 are each independently alkyl, cycloalkyl, or benzyl groups wherein the alkyl or cycloalkyl group can have from 1 to 18 carbon atoms, optionally hydroxyl or halogen substituted, and wherein R 2 and R 3 can be a single hydrocarbon group that in combination with the N of the Y group forms a cyclic amine which can be saturated or unsaturated; and W - is a colourless anion, and wherein the particulate solid is a mixed metal oxide pigment that develops its color intensity and hue after firing at elevated temperatures.