Ideal for natural, lightened or highlighted cool blonde hair in need of neutralisation, this rich purple mask penetrates the hair fibre to remove unwanted yellow undertones and brassiness, while deeply hydrating and restoring hair strands'. '.strtoupper('t')he powerful combination of hyaluronic acid and edelweiss flower soothes hair, protecting it from daily oxidation and pollution particles'. '.strtoupper('t')his non staining hair mask can be used once a week, or as often as needed to neutralise brassy tones and keep your blonde hair luminous and cool'. '.strtoupper('t')o use apply on washed and towel dried hair'. '.strtoupper('m')assage onto lengths and ends'. '.strtoupper('l')eave in for 5 minutes for light neutralisation or longer up to 10 minutes for stronger neutralisation'. '.strtoupper('a')dd water, emulsify and rinse thoroughly'. '.strtoupper('t')oday, more than ever, the world needs care responsible and sustainable care'. '.strtoupper('s')ince 2013, kerastase has resolved to extend its expertise in the art of care by committing to using less virgin plastic'. '.strtoupper('d')rawing on their excellence in innovation, finding new ways to cut down on waste and empower their customers to make more sustainable choices'. '.strtoupper('k')erastase is committed to optimising packaging whenever possible, using less virgin materials and more recycled materials, recyclable packaging and refillable delivery systems'. '.strtoupper('b')eginning with shampoo bottles and branching out to more and more products, they are creating a sustainable packaging program, with many more refill innovations to follow'. '.strtoupper('k')erastase is also committed to more sustainable production and since 2019 their factory in burgos, spain has achieved carbon neutrality by improving energy efficiency and using 100% renewable energy'. '.strtoupper('s')ince 2017 the burgos production facility has also been a 'waterloop' factory'. '.strtoupper('t')his means that 100% of the water used for production processes is recycled and reused in a closed loop'. '.strtoupper('t')he external water network is only used in the composition of the products or for employee's day to day needs.