Hello Reader,One of the first things I heard about when I joined my first Facebook gray hair support group was purple shampoo.There was so much chit-chat about it, and a lot of confusion about when was the right time TO use it or IF you needed to use it. Some people hate it because it can dry out your hair, tint your hair purple, or trigger dye-related allergies. Other people love it because - if used properly - it can reduce the appearance of yellow tones in gray hair and brighten up the...