Hair Brassiness: All you need is one packet of Grape Kool-Aid Powder: 1. Wash hair with a mixture of the Grape Kool-Aid powder (just a pinch) and 4 Tablespoons of your regular shampoo. Rinse. Style as you always do. 2. The purple blue cancels out the brassy gold orange over-processed shades because it is on the opposite side of the color spectrum.