For Colour-Treated Hair: Pureology Hydrate Colour Care Superfood Mask
Harriet Muldoon, a colourist at Larry King salon in London (who is known for being particularly adept at creating natural-looking shades of blonde), recommends Pureology Hydrate Colour Care Superfood Mask (£20). She notes that it's especially great for those with bleached hair thanks to its rich, nourishing formula that contains both coconut and avocado oils.