LUSH Daddy-O purple shampoo for blonde/gray hair. This is one of the best purple shampoo's I have ever used, and the fact its all natural, vegan friendly and no animal testing makes buying it even eas (Best Shampoo Brands)
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.