Written on: 15/08/2010
I too suddenly had a allergic reaction to a salon dye which left me with itchy hives. I went for medical patch testing and found that i am allergic to ammonium and formaldehyde (found in almost everything!). I have been using sanotint for a year now and so far so good. I buy the light brown. It covers 40% grey well but looks dark initially. However, it does fade to a nice light brown after a couple of weeks. Incidentally, i have tried no end of so called natural shampoos etc. The only shampoo that didn't cause me a reaction is by GreenPeople. Hope this helps.