Which is the best purple shampoo, one that would really work ?

okay I dye my hair blonde, I have naturally light brown hair.


I dye it natural palest blonde 99 from nice n easy. it comes out a little brassy though. I sort of have the the Louren Conrad colour. but I want it ashy and greyish looking, like with a platimun shine.





what would be the best purple shampoo to buy. one that would really make my hair platinum looking.





BTW , i know that it wont lighten my hair, i just want to get rid of the brasiness.Which is the best purple shampoo, one that would really work ?
u dont use a purple shampoo....you use a toner


a purple or blue toner