I have been using Malibu Crystal Gel for years. My assistants have quit asking me to help in color corrections because I always say "Crystal Gel it first." It is a great way to see what can be removed from the hair. Crystal Gel also leaves the hair prepped and ready for the next steps. It is also a great finisher. Crystal Gel stops the peroxide action, leaving the scalp and hair back at its own pH balance (better than any shampoo can do). So after all that hard color correction work, your color will last longer and the scalp won't be as irritated.