Blondesse No Yellow Mask

After No-Yellow Shampoo, wearing appropriate gloves and apply to towel dry hair, massage evenly all over and comb. Leave on from 3 to 5 minutes and rinse accurately. FDA Caution for USA: does contain an ingredient that may cause skin irritation on certain individuals and a preliminary test according to accompanying directions should first be made. This product must not be used for dying the eyelashes or eyebrows, to do so may cause blindness. Preliminary patch test: rub a tiny bit of the dye on the inside of the clients elbow or behind their ear. Leave it there for 2 days, if they get a rash, do not use the dye on their hair. You should do a patch test each time you dye your hair.