Hair dye

A couple weeks ago, I allowed my daughter to put temporary red streaks in her hair (winter break). She was quizzing me about temporary hair dye, permanant hair dye, how it works, etc. I explain to her at some point that it's a bad idea to start dying your hair permanantly, because then you have to continue to do it the rest of your life, or else your hair will be half one color, and half another. She said, "Like yours?" with a smirk on her face.