Total Results Dark Envy Shampoo is a green colour-depositing toning shampoo that enriches dark bases and neutralises red undertones. Key Benefits: For virgin and all-over black to dark brown hair colour Neutralises red undertones Leaves depth and cool, glossy finish Combination of blue-yellow direct dyes Signature fragrance of citrus, jasmine and cedarwood What Causes Red Undertones In Dark Bases? Red undertones in dark bases can be caused by sun, water/chlorine, bleaching/highlighting, and chemical processes or excessive use of hot tools. Dark Envy contains direct dyes that help neutralise red undertones in hair levels 1-4. Brass Off contains direct dyes that help neutralise orange undertones in hair levels 5-7. So Silver contains direct dyes that help neutralise yellow undertones in hair levels 8-10+. Dark Envy should not be used on white or grey hair as it can leave a greenish hue.