Wella Colour Touch Plus mixing with special mix?

[Nan21]

Hi can you mix Wella ct plus with ct mix tones . I have a customer Tomo ( I’m mobile) who has just messaged to say she fancies a purple brown now ... I have already got the ct plus 55/05 I was going to use ?? Can I mix /68 mix tone into it ?if so how much ? As I’m thinking the double base will knock some of the tone won’t it ?? Thanks guys also the wholesalers is closed Tomo

 

[mature novice]

Did you ever get an answer on This? How did it go?
Sounds like a good mix to me but depends what her hair was like to start with .