Great article, Michele! I have my hair colored/highlighted by a hair professional. We used to do all-over color, which was terribly itchy on my scalp. I could definitely tell if I hadn't taken an anti-histamine before heading to the hair salon. My stylist would even call me before an appointment to remind me to take it. After having this reaction on a couple visits, we decided to change the process. I definitely have a lower reaction to the coloring she does now.
This article is a good call to action for those who color at home or get it professionally done. If you do use a professional, work with them to find a process that isn't harmful to you (natural hair coloring?), or (gasp!) give up coloring.