Use two mirrors : Coloring the back of your head can be tricky. As you apply dye in front of your bathroom mirror, hold up a handheld one to ensure you don't miss spots, Hill recommends. Have cleansing cloths on hand : Use wipes like Neutrogena Makeup Remover Cleansing Towelettes to soak up any dye splatters as they happen. If you wait until you're done, they may have already set. ("I still have stains I can't get off!" one tester sighed.)
If you're thinking about a major hair colour change, you'll love these apps to help you try on a new hair colour, risk-free. Some of the apps I've tried in the past are so awful and spammy. These are really good fun to play with, even if you just want to see what you look like with pink hair. You can experiment with your hair colour, risk-free. Best of all, these apps are free too! Note they do have some in-app purchases, but I've been testing them and find the free versions are good enough.