Colour help please! Majiblonde 921s?

[Shamrock2001]

Hi for years I've been using majiblonde 901s with 40vol and have always had desired lift but not really desired shade. My hair is naturally a mousey colour being darker at the roots. I do my roots every 4-6 weeks but there always brassy! I come from a long line of auburn haired ladies! As i said the lift is good I'd jus like it less brassy! Would a 921s do the job??
Thanks in advance

 

[ColorMeGiddy]

If you are extremely brassy then you are not lifting to a high enough level. I would suggest either timing it longer or a double process first. Then Toning with your desired formula.