Mixing Hair Dyes

Hello!

I know this isn't an alternative colour question but I do have Manic Panic Blue in my cupboard... ;D

My recent history (in a nutshell)..

Summer 2016 - my hair was to my chin - completely natural (no dye AT ALL) as I was growing out a crop so decided not to dye it and it was LOVELY!!  A cool brown (NO RED) with random white hairs (wisdom highlights)..... BUT I got bored...

Late summer 2016 - Sunkissed (I know I know!!!!)

Autumn to Now - dark dye, vitamin c treatment, highlights then dark dye then vitamin c treatment - & repeat!!!

Present Time:  Slightly fried hair (but still reasonably decent condition - not falling out just yet..)  But I would now like to get back to my original hair colour  *censored*...

So I plan to do another vitamin c treatment to get all the box dye out and assume I'll end up with an orange base.....  Then I was going to mix Topchic 6SB (silver brown) and 6A (dark ash blonde)....

My question (finally) is - what will happen when you mix silver and ash....  I'm hoping for this sort of colour....(hopefully there's a picture attached...)

Any thoughts????

Thanks.,
Tara