It is very important and we stress to ALWAYS do an allergy test according to the kit directions before applying any new color to your entire head. Allergies aren't to be taken lightly. Some allergies can develop over weeks time. Or even after repeated exposure. Just because EcoColors is p phenylenediamine (ppd) free, doesn't mean you won't react. There are other oxidative dyes present in nontoxic amounts that some individuals may be sensitive to. Make sure to have a plan in place with your physician in case you do experience any kind of allergic symptom.
