Overtone has today launched its highly-anticipated Mixology Collection. The new release features four new semi-permanent, custom hair color kits inspired by an array of vibrant cocktails and mocktails and the artists who create them. Color kits include Berry Smash, Brunch Punch, Sunset Spritz and Negroni.    Each curated set combines three of oVertone’s coloring conditioners in unique ways to produce soft pink, warm orangey yellow, fiery orange red or bright raspberry shades. Vegan and c...