This purple shampoo is equally good for chemically treated hair or bleached hair.
Then calculate what it will actually cost you in the long run.
Your shade of blonde, the texture of your hair, the amount of product in your hair, and how you go about using it can lead to drastically different results with the same purple shampoo.
A little bit goes a long way; with just a small amount, you can lather up the shampoo to coat all of your hair, providing you with easy toning.
It is easy to gradually go lighter and lighter, but bleaching your hair can cause a lot of damage.
You need to use a lot of it to get the yellows out.