What Color Neutralizes Red . If it is a lighter shade of purple then use orange to cancel it out. It all depends on the shade of purple. Neutral Red color hex code is AB6465 from www.color-name.com Wash your hair when you need to, and on the days in between, opt for a dry shampoo to absorb excess oil instead. Violet, purple and purple based toners cancel out yellow and pale yellow.; Use from 2 to 3 drops of green food color and add them to the shampoo and conditioner and shake well.