Neutralising Blue Mask For Toning Lightened Brunette Hair. Highly pigmented blue-violet tones neutralise and eliminate brassy/orange tones to maintain lightened hair. Protected Colour. Professional Care. After using Brass Off Shampoo, apply to wet hair. Avoid scalp area and leave on for 5-10 minutes depending on desired neutralisation. Rinse and follow with Blonde Threesome leave-in cream.