Liquid developer

A liquid developer for electrophotography which consists essentially of a dispersion of an anthraquinone dye or pigment finely dispersed in an electrically insulating hydrocarbon liquid consisting essentially of isoparaffinic hydrocarbon selected from the group consisting of a mixture consisting substantially of isoparaffins containing from 9 to 11 carbon atoms and having a boiling point range of from about 320.degree. F to about 350.degree. F, a mixture consisting substantially of isoparaffins containing 8 to 12 carbon atoms and having a boiling point range of from about 345.degree. F to about 375.degree. F and a mixture consisting substantially of isoparaffins containing 9 to 14 carbon atoms and having a boiling point range of from about 354.degree. F to about 386.degree. F, and from 0 to 30% by volume of an aromatic hydrocarbon in which the anthraquinone dye or pigment is substantially insoluble said anthraquinone dye or pigment have the formula:

• ##STR30## wherein R.sub.1 to R.sub.8 are selected from hydrogen, halogen, hydroxyl, amino, -SO.sub.3 M, in which M is hydrogen, an alkali metal or an alkaline earth metal, and a substituent of the group consisting of
• a. an alkyl group,
• b. an alkoxy group,
• c. an alkylthio group,
• d. an alkylamino group,
• e. an alkylcarbonyl group,
• f. an N-alkylcarbonamide group,
• g. an N-alkylsulfonamide group,
• h. an alkarylamino group,
• i. an N-alkarylcarbonamide group,
• j. an N-alkarylsulfonamide group,
• k. an alkylbenzenesulfonamide group,
• l. an alkylarylamino group,
• m. an alkylamino-triazinylamino group, and
• n. an alkaryloxy group,
• each of the above groups (a) to (n) having 8 to 24 carbon atoms in the alkyl portion, and wherein 1 to 4 of R.sub.1 to R.sub.8 are substituents selected from the said groups (a) to (n);
• and from 0 to 30% by volume of an aromatic hydrocarbon, the liquid developer containing 0.05 to 5 grams of said dye or pigment per liter of said liquid developer.