The use of N-substituted-5,6-dihydroxyindoles in solution as a hair dyeing agent in combination with the pre-treatment of the hair to be dyed with a solution comprising the water soluble salt of various metals is also provided. This yields hair colors from light golden to light reddish brown to dark auburn to black.
此外,还提供了将 N-取代的-
5,6-二羟基吲哚溶液用作染发剂,并结合使用包含各种
金属的
水溶性盐的溶液对待染头发进行预处理的方法。这样可以染出从浅
金黄色到浅红褐色到深赤褐色到黑色的发色。