Lasts about two weeks or so depending on how frequently you wash your hair. The color comes through better with more lightened hair, close to white/platinum.
Is Ion a good hair dye?
One review stated that combining it with keratin hair conditioner created a bright color that lasted for weeks. While they wanted a longer-lasting hair dye, they were happy with the ultimate results. ... Another reviewer simply said that it was the best hair dye that she had ever used.Jul 25, 2016