Another blond hair colour trend is "alpine ice," as Schaudt calls it. "This icy shade is achieved by using foilayage or balayage. It keeps minimal dimension at the base with full saturation of blond through the ends. A toner can help achieve this ash blond, along with frequent use of blue shampoo at home. Toning is important so there's minimal damage by overlapping lightener."
No matter which colour you choose, Hillier recommends you keep it healthy in between appointments to ensure the least amount of damage. She suggests Olaplex treatments, which features "patented formula which allows for the colour molecules to latch inside the hair bonds for an anti-fade like treatment."