The Redken Color Extend Magnetic Mask is a treatment for coloured hair helps you to retain that fresh from the salon vibrancy. Working by attracting to colour molecules, this mask actually traps them into the hair fibre which in turn helps to preserve colour richness and extend the life of your colour. -E.DDirections of use:- Apply to wet hair and leave in for 5 to 15 minutes depending on the condition of your hair.- Rinse thoroughly.- Can be used weekly or daily if needed.