Allergy test should be performed 48 hours before applying. Do not color the hair if you already experienced an adverse reaction to a hair colorant or if you have sensitive, itchy or damaged scalp. This product must not be used to dye eyelashes or eyebrows; to do so may cause blindness. If any color cream splashes or accidentally contacts with your eyes, rinse immediately with plenty of water and seek medical advice if irritation persists.