Hi, I recently had my hair lightened from my natural level 6 to a level 9. Even though the salon did a great job I feel it looks a little too warm and golden now. So I went to Sally's and asked for a toner to create a more ashy toned look. The girl there recommended wella koleston perfect in special blonde 12/1 with a 3% 10 vol developer. She also said to apply it but to keep an eye incase it grabs too much and turns khaki colour. What concerns me more is having now read that the 12 line in koleston shouldn't be used as a toner, only the 10 line? Is this true? If so I'm a bit annoyed that I was sold the 12.