Product Description From blondes to brunettes, drops will eliminate any unwanted yellow or warm hues in your hair. Purple Boost gives the power and control to achieve creamy to transparent white blondes , leaving the hair with the perfect cool hue. When added to your color, Purple Boost becomes an instant toning tool . You will be able to cool down your golden blondes and brunettes giving you astonishing results. It can even add a slight violet iridescent hue to your pre-lightened hair. You can add a personal touch to your care by adding Purple Boost to your favorite regimen.