The bottom half didn't take the dye! At the moment, it's half red and half blonde and this is the second time it's happened. It looks a little ridiculous and I was wondering if there was any way to fix it?
Like mentioned you need a pre-pigment or filler. They have them at sallys, but make sure you the filler is in the same color family.
When I add red to clients, I will use redkens "red kicker" and a mix of what ever red they're trying for.