To keep the blonde color/highlights of hair fresh and bright, a purple-based shampoo can be of help. Try John Frieda Sheer Blonde Color Renew Tone Correcting Shampoo. It neutralize brassiness and give a clean overall tone. Developed with color-correcting technology the purple shampoo can correct the blonde tone, and renew the blonde color of dyed hair making the difference in visible in about 3 washes. It also features optical brightening technology that works to radiate white-bluish glow and absorb UV rays. The blonde highlights/dyed hair become much more bright and noticeable. The shampoo works best with John Frieda Sheer Blonde Color Renew Tone Correcting Conditioner.