Keratin.comhttp://www.keratin.com/
Comprehensive, intelligent, informative site on hair.

Scientists Link Some Hair Dye to Cancer (Non-Hodgkins Lymphoma)
New York Times Article 

Links to cases of severe allergic reactions to synthetic hair dye.  

Not to make you paranoid or anything, but HERE is what can happen to YOU if you keep using chemical hair dyes!  Stop using chemical hair dye! Start using henna!

Blinded and hospitalized by chemical hair dye: head began to leak pus.

Skin weeping,  unable to breathe or see from allergic reaction to chemical hair dye

Reaction resembling chemical burns over head and body from chemical hair dye

Hospitalized in burn unit from allergic reaction to chemical hair dye

Unable to breathe, rushed to hospital, from allergic reaction to chemical hair dye

In intensive care after allergic reaction to chemical hair dye

Rushed to hospital with allergic reaction to chemical hair dye

Rushed to hospital after chemical hair dye; swelling  forces eyes shut and blocks breathing

Hair loss and hearing damage from chemical hair dye

Man severely ill after chemical hair dye

Hospitalized for three days after chemical hair dye

Coma after chemical hair dye

Death from chemical hair dye

Perri Jackson's Story