Kérastase Blond Absolu Heat Protecting Serum Keep blond styles safe from heat with this Kérastase Blond Absolu Heat Protecting Serum ($37). Its light purple colour does offer some toning of brassiness, but its greatest strength comes from the antioxidants that safeguard hair before heat styling. Image Source: sephora.com Kérastase Blond Absolu Heat Protecting Serum $37 from sephora.com Buy Now