Vadre Grigsby, PRAVANA Artistic Color Director is all about the new grunge look. For the @katyperry “Green Slime” look she suggests to pre-lighten the lengths to level 9 pale yellow (deepen the base to ChromaSilk 4N with 10 Volume for deposit only, if needed), shampoo, and dry the hair. Mix 2 parts VIVIDS Yellow, 2 parts VIVIDS Clear, 3 parts PASTELS Mystical Mint and 3 parts PASTELS Blissful Blue. Apply through the pre-lightened ends. Process 20 minutes at room temperature, shampoo, and style as desired. (via @modernsalon)