Share 'Can you be allergic to natural hair dyes?'

In view of serious health warnings in the press regarding chemical hair dyes, I have been researching allergic reactions to henna and indigo. From everything I have read it would seem that PURE Henna is SAFE and allergies are very rare, but they do happen. Pure henna has been in use for thousands of years. It's one of the safest things you can put on your skin, and reactions are very unusual. On…