cible, organic solvent boiling above about 175 C. containing dissolved therein a nonpolymeric organic cationic mordant for acid dyes at a ratio of said mordant to said solvent of about 1/ .25 to 1/2 by weight, said mordant having the formula wherein R is an alkyl radical and X is an acid anion, at least one R having at least 8 carbon atoms. 6.