The Matrix Dark Envy Shampoo is perfect for darker shades of hair, especially black and dark brown . Neutralizes and cools downs hair colour. It can be used both on natural and dyed hair. It has a pleasant scent of citrus, jasmine and cedar wood. Red undertones can appear on dark hair as a result of sunlight, water, chlorine, chemical treatments and thermal styling. The shampoo has a dark green colour. A combination of blue and yellow pigments gives a green pigment that eliminates unwanted shades and cools down hair colour.