Abstract: This invention is concerned with dispersions of solids in organic liquids containing polymeric or resinous dispersing agents. The fluidity of such dispersions is greatly improved by the presence in the dispersions of a substituted ammonium salt of a colored acid wherein there are between 16 and 60 carbon atoms contained in at least 3 chains attached to the N-atom of the substituted ammonium ion. The dispersions are particularly useful for the preparation of ink and paints.

Abstract: Dyestuffs of the formulaeD--Z--O--OC--X--O).sub.y H].sub.nandD--Z--O--OC--X--O).sub.(y.sub.-1) COT].sub.nwherein D is the radical of an anthraquinone dyestuff which is attached to Z through a carbon atom of an aromatic ring present in D; Z is a divalent bridging group; n is a positive integer having a value of 1 to 4; X is a divalent saturated or unsaturated aliphatic radical containing at least 8 carbon atoms and in which there are at least 4 carbon atoms between the --CO-- and --O-- groups; T is a saturated or unsaturated aliphatic radical of from 8-20 carbon atoms and y is a positive number in the range 2-20 inclusive.A process for making the above dyestuffs and their use as dispersing agents in the stabilization of dispersions of finely divided solids.