Im thinking your right, especially mixed w/ hard water. Using a cg friendly shampoo/watered down,conditioners on the ends, slowed the drop out rate for me too..How often do you shampoo? I notice my color lasts twice as long, if I only do it weekly, or biweekly.
Originally Posted by mbeckhhp

Although I can't say from experience, it sounds to me that you make a good observation about the color lasting twice as long. I haven't colored my hair in the 8 months that I have been CG, but that's not to say that I never thanks I will keep that in mind.