Is ammonia free hair color really safe?
Recently I've decided to start coloring my hair out of necessity to cover the gray hair. I've wanted to buy an ammonia free hair color like the L'oreal or the Matrix ones, however I found different articles on the web which say that hair dye without ammonia is not totally safe. Read here for an example: http://www.reviewsandlifestyle.com/2012/10/are-ammonia-free-hair-colors-really-safe.html
Is it true? Ammonia free hair dye is as damaging as the original formula?