L’Oréal Professionnel Serie Expert Blondifier, 500 ml, Hair Masks for Women, The L’Oréal Professionnel Serie Expert Blondifier hair mask is an essential step in your hair care ritual. Give it a moment to regenerate and it will repay you with vitality and beauty. Characteristics: regenerates the hair along its entire length makes it easy to comb through and prevents damage extends the life of hair dye neutralises yellow undertones in your hair for both natural and dyed hair How to use: Wash with shampoo, then apply to damp hair. Leave to act as instructed on the packaging, then rinse thoroughly.