Please can anyone help me I have searched and can’t find much on it. Tone /7 wella what and when is it used for could I use 4/07 on a client if I was lifting her hair from a base 3 bleach bathing it out to go to a base shade 4. Would 4/07 work or would this look to warm? This tone really confuses me because it has the warm tones and the cool one?