Keep your hair black longer and save yourself some $$$!!!
Use a dark shampoo!!! Aveda Black Malva Shampoo is your best bet. Grab that at the Aveda salon in the lower level of the Hancock or at the Bravco on Oak St.
To keep your hair light blonde or white:
Use a purple or blue shampoo!!! I suggest AVEDA Blue Malva!!! Trust me on this one!!!
Warning!!! If you use these every day, they can actually make you hair look a little weird. Use it 3 times a week or use half of your regular shampoo and then half the colored shampoo.