According to Glamour, Celeb hair pro Doug Macintosh of New York City's John Sahag salon is using the same coloring trick I have used for YEARS - 1/2 red + 1/2 blonde colored conditioner left on for 20 min. (except I also add highlights with reg. hydrogen peroxide on new growth of dirty hair and also used 1/2 red + 1/2 blonde colored shampoo, too!!)
