Kristin Ess The One Purple Shampoo and Conditioner Set, 10 fl. oz. each;

I love brass... in my house, not your hair. I wanted to create a purple shampoo and conditioner that was both great for toning and also sulfate-free because I've always had a hard time finding that combo. If you like ashier tones, you can use this every time you shampoo. If you want more neutral tones, use it every other time you shampoo to balance out unwanted brassiness. And yes, this set can be used on color treated or naturally blonde hair.
One and done.