What to expect with Koleston Perfect 7/1 + 40% vol on the roots?

[astralica]

What color do you think it would be if using Koleston Perfect 7/1 with 40% on the roots? Would it lift any levels at all or may it be darker than the roots in the picture?

Many thanks in advice for any help!

 

[cassies97]

Are you a qualified hairdresser?

 

[AcidPerm]

Can you confirm your hairdressing quals and also, what level is the root area and what are you wanting to achieve?