Okay, so, I have these black really wiry coarse hairs that are unlike the others and I find them either black at the roots or black all the way through the strand of hair. My natural hair color is dirty blonde. I use Biolage shampoo and Kenra conditioner, only occasionally I style my hair with heating products. I get my hair high lighted once in a while and that's it. My dad has jet black hair and my mom naturally has red hair. Keep in mind that I'm 13yr old girl .. I usually brush my hair with the Wet brush after I shower. Anything that I'm doing that causes this, and what is it?