Kérastase Reflection Cool Blonde Purple Colour Correcting Treatment If there's just a specific spot on your hair that you'd like to tone out brassiness (like on the roots, tips, or highlights), this Kérastase Reflection Cool Blonde Purple Colour Correcting Treatment ($39) can be spread right on those areas to neutralise colour with the treatment's cool, purple pigments. Image Source: sephora.com Kérastase Reflection Cool Blonde Purple Colour Correcting Treatment $39 from sephora.com Buy Now