Usually, ammonium hydroxide is used in hair dyes and colors to open up cuticle of the hair and to eliminate the previously applied color and thus enable the fresh allergens to make way to the cortex of the hair.Natural dye shampoo do not cause any irritation to your skin, which is one of major drawbacks of an ammonia based hair dye. Besides that the ammonia-free shampoo promotes hair growth and is free from pungent smell.  https://herbishh.com/products/herbishh-color-shampoo