Try straight food coloring. Every city has a professional bakery supply store (look in the yellow pages under bakery supplies). That is where you'll find 'paste' foodcoloring in every color imaginable. It's very inexpensive and has an excellent consistancy for application. Do not get it on anything you don't want to stain and be sure to use gloves during application and rinsing your hair. It works best on prebleached hair but can be used on hair that has not been colored. You can also add it to shampoo to help refresh your color. Just remember it stains everything.