How to dye ash blonde hair,medium brown?

You should use a direct dye such as adore. They are non-damaging and the colour usually requires less upkeep than box dyes.

I've recently dyed mine mid brown (but with a bit of an auburn tint) I used Adore dyes but they needed up every few days so I put a permanent brown on (I used wella koleston) and I keep that fresh with adore dyes now- it seems like the permanent brown 'stuck' better over the adore (I used mahogany ) and the adore sticks better over the permanent brown than it did over bleach but not sure what to do if you don't want a warm/ gingery brown. I'd bear in mind your condition too though, mine was only ever bleach bathed once, I never overlapped it when I touched up my roots, but the condition feels a bit nasty now!