2,6-Dimethoxy-3,5-Pyridinediamine HCl is used to formulate hair color products. It reacts with the activated primary, such as ME+, p-Aminophenol, Pyrazole etc. 2,6-Dimethoxy-3,5-Pyridine Diamine HCl forms multiple different molecules of different colors. It is responsible for cold color direction like ash, blue and dark green. It is mainly used in the mix tones of our hair color line up.