PURPOSE: To obtain a hair-dye enabling fast-dyeing of hair without damaging the hair, free from stimulation and giving excellent feeling in use by using 1,2-hydroxy-1,4-naphthoquinone in combination with an organic compound containing nitrogen atom.
CONSTITUTION: The objective dye contains 1,2-hydroxy-1,4-naphthoquinone as the 1st essential component and a nitrogen-containing organic compound as the 2nd essential component. One or more substances such as chemically synthesized substance and dried powder of henna leaf may be used as the 1st essential component. The 2nd essential component is lauric acid, myristic acid, etc. The amount of the component is preferably 0.1-10%, especially 0.5-3% based on the total composition. When the amount is less than 0.1%, the finished state of hair sometimes becomes poor and when it exceeds 10%, the dyeability may be deteriorated.
SASAI TAKASHI
BANDAI HIROSHI