Vidal Sassoon is rolling out new Vidal Sassoon Salonist, a new at-home hair color system said to be inspired by Sassoon’s color artistry. The system, which gives women the tools and techniques that will elevate their home hair color to an art form, incorporaties an exclusive two-step technique that treats roots and lengths separately.   The color formula in Vidal Sassoon Salonist has been specifically created to give the perfect consistency for use with a brush and bowl –like in the salon – so w...