I am trying Eco Colors and am going to post my results here. From personal experience I can testify that an ALLERGY TEST is and ABSOLUTE MUST. I've used various hair dyes in the past and for those just starting realize that the ALLERGIC REACTION starts HOURS after dyeing and gets WORSE for DAYS and does NOT GO AWAY ... until the hair is cut off. That said, I am HOPEFUL about this product! I am two days into the allergy test with no reaction! I intend to list my progess on Eco Color's message board in hopes of providing FAIR information to others looking for a hair dye that does not cause allergic reaction.