I am using wella T18 lightest ash blonde for the toner in 42 mL (1.4 FL OZ LIQ.)and on the toner it said to mix 1 part Wella Color Charm toning color with 2 parts 20 volume Wella Color Charm developer.
Btw, I am using a 30 developer. So my question is..
-How do I mix hair toner with developer?
-how much developer do I need to mix with the toner ?
- do I use the whole bottle of toner to mix with the developer ?