Key Benefits: Best formulated for virgin & colored all-over black to dark brown hair (best for levels 1-4) Signature fragrance of citrus, jasmine & cedarwood Matrix's Total Results Dark Envy Red Neutralization Mask has a combination of blue-green pigments to counteract and neutralize red undertones in dark bases. After using Total Results So Silver shampoo, wearing suitable gloves, apply to wet hair and comb through for even distribution 2. 3 minutes for subtle neutralization, 5 minutes for maximum neutralization. Avoid scalp area and leave on for 3-5 minutes depending on desired neutralization. https://www.matrix.com/.../brass-off/brass-off-custom-neutralization-mask Enrich dark bases with Dark Envy - Our first range that neutralizes red undertones in virgin and all-over black to dark brown hair color. Dark Envy Red Neutralization Hair Mask has a complex concentration of dyes to neutralize red undertones on dark brunette bases while deeply nourishing the hair fiber and leaving a radiant sheen.