I've always used Wella Koleston Perfect and don't know anything about the other Wella lines. For a client with 40% gray, should I stay with Koleston Perfect double base naturals for best coverage?
Also, I've lately been using generic peroxide rather than Wella's because it's not been available here but I've noticed the color lightened very quickly. Could the developer be the cause? How important is it to use Wella developer with Wella products, basically...
Also, I've lately been using generic peroxide rather than Wella's because it's not been available here but I've noticed the color lightened very quickly. Could the developer be the cause? How important is it to use Wella developer with Wella products, basically...
