Book excerpt: With thousands of hair care products on supermarket, drugstore, and salon shelves, each with its own grandiose claims, consumers are understandably confused. In this new edition - with over 75 percent new material - the "Ralph Nader of rouge" applies her high standards to shampoos and conditioners, styling gels, mousses, hairsprays, dyes, and permanents, and also devotes a chapter to the concerns women of color may have, from relaxing techniques to braiding and weaving.