Being a bottle blonde is not for the dumb — or lazy, for that matter. You have to maintain roots all the time, and then there's the ultimate enemy of all blondes: brassiness. But how does one fight the creeping orange, besides frequent trips to the salon and/or Walgreens hair dye aisle? Purple shampoo. More specifically, shampoo with violet leaf extract, which is a deep and slightly staining shade of blue-purple.
To keep your hair from getting orange, put something that's on the opposite side of the color wheel on top of it, and bam! Brass neutralized. Blondie Bella uses purple shampoo every other day, and says it definitely helps you get the most wear out of your color. If you have any gray hair, these are also great to keep it from taking on a yellowish cast. There are also enough options to satisfy most people's needs, from drugstore bargains like One 'n Only Shiny Silver Conditioning Shampoo ($5) to more natural products like Lush Daddy-O ($9) and Unite Eurotherapy Blonda Shampoo, which is only available in salons. A brighter future (at least on top of your head) is a shampoo away.