The last couple years, while working in film, I have come across a number of people that are severely allergic to hair color. What do I mean by severely allergic? Severely allergic to the point that they could die if they continue to color their hair and go against their doctors orders. This is something we are taught in school but it always seemed like something that was so very rare to the point of being a non issue. However it is a real issue for some ladies. What are the