Coloring of organic materials with asymmetric thioindigoid compounds

Claim 1

In a method of coloring synthetic or semisynthetic organic high molecular weight material in brilliant nuance with characteristic fluorescence by (A) fixation of the coloring material on the synthetic or semisynthetic high molecular weight organic material by (i) heating the organic material in an aqueous dispersion of the coloring material; (ii) printing the coloring material onto the organic material; or (iii) impregnating the organic material with an aqueous dispersion of the coloring material; or (B) admixing the coloring material with the molten synthetic or semisynthetic high molecular weight organic material, the improvement comprising using as said coloring material an asymmetric thioindigoid compound having the formula: ##SPC5## wherein R 1 , R 2 and R 3 may be the same or different and are selected from the group consisting of a hydrogen atom, chlorine atom, lower alkyl group, lower alkoxy group, cyclohexyl group, phenyl group, tolyl group, chlorophenyl group, benzyl group, methylbenzyl group, chlorobenzyl group and styryl group, R 1 and R 2 may together form a tetramethylene ring, R 4 is a member selected from the group consisting of a hydrogen atom and methyl group with the proviso that R 4 is a methyl group when R 1 , R 2 , and R 3 are each a hydrogen atom and R 4 is a hydrogen atom when R 1 is a methyl group and R 2 and R 3 are each a hydrogen atom.