I use a home dye (Superdrug) permenant dye - I used to have past my shoulder length but now it's short ( last time I dyed it, my hair was long)
So - what do you do?
Buy a tint brush and bowl kit and use half the bottle and tube?
Or think "Hang it, it's cheap enough, mix it all up and use what I need"
If I use the brush then I'll only do the roots this time, then the bottle next time to do the whole length (by which time it'll be needing cut again so I don't need to worry about colour overlap )
If I use the whole bottle then I'll do the whole head