The Ultimate List of Must-Have Products For Blondes

Redken Blonde Idol Custom-Tone Conditioner ($32) is a lot of fun because it works almost like a science project.

Two chambers — one containing a violet conditioner — have formulas that deposit color into the hair, depending on where you're at with your color. You adjust how much from each chamber is needed, so your hair remains vivid and hydrated between salon visits. This option is for cool-blond and platinum shades.