AN ACIDIC HAIRDYE COMPOSITION COMPRISING 0.01 TO 1% BY WEIGHT OF AT LEAST ONE ACIDIC DYE, 0.1 TO 10% BY WEIGHT OF AN ACID AS A pH ADJUSTING AGENT, 1 TO 2% OF AN AROMATIC ALCOHOL AS A PENETRANT, 1 TO 20% BY WEIGHT OF A LOWER ALCOHOL AS A SOLVENT, 0.01 TO 5% BY WEIGHT OF A POLYMER COMPOUND AS A THICKENER, BASED ON THE TOTAL WEIGHT OF THE COMPOSITION AND THE BALANCE WATER. THE ACIDIC HAIRDYE COMPOSITION IS STABLE THOUGH IT IS STRONGLY ACIDIC HAS HIGH FLUIDITY, EXHIBITS EXCELLENT USE FEELING, CAUSES SUBSTANTIALLY NO COLOR MIGRATION SUCH AS ATTACHMENT OF THE DYE TO THE SKIN OR CLOTHES AFTER USE, NEEDS NO WASHING OUT, HIDES WHITE OR GRAY HAIR BY A SINGLE TREATMENT THEREWITH AND DYES WHITE OR GRAY HAIR BY 4 OR 5 TREATMENTS THEREWITH TO MAKE THE WHITE OR GRAY HAIR INCONSPICUOUS.
