Cosmetic hair dye composition based on a powder of vegetable origin

A water-dilutable dyeing composition in dry form for application in diluted form to human hair to color said hair comprising an effective amount of a hair dye and between 2 and 95 percent by weight of said composition of a plant extraction residue, as a thickening or opacifying agent for said composition, said residue being the remainder of the extraction of essentially all the active principles present in said plant, said plant being selected from the group consisting of saponaria, ivy, hawthorn, arnica, ruscus, horse chestnut, eucalyptus, horsetail and witch hazel and being extracted with a solvent selected from the group consisting of ethanol, isopropanol, ethylene glycol and a mixture of water and ethylene glycol monoethylether, said plant extraction residue being in powder form having a granulometry less than 125 microns.