HI :)

I`ve just gotten my previously colored hair which was loreal majirel #6 with a fairly dark mahogany. Its nice but maybe a little too dramatic and artificial for me. I don`t want to get anything fixed because I`ve done that so much in the past LOL:(
I like the darker shade because it`s only slightly darker than my natural hair color. BUT... I do my own roots with the loreal majirel line and am wondering if I mixed half the #6 dark blonde with half #5 brown to do my roots... would it be horribly noticeable as the mahogany was growing out?

Thanks so much for any advice

P.S.

I forgot to say that I use a permanent as my hair is about 35 to 40% grey.