I had never done it before and got a little hesitant so didn't use the entire bottle. It turned my hair slightly red/purple but you can only tell in sunlight.
I'm wondering when is too soon to try again with the same color for a more efficient, noticeable result given that it's a temporary (washes out in 28 shampoos) color.
Will it harm (and how) my hair to do it again already (two days later), or do i need to wait the month for it to wash out. And if I don't have to wait, should I use the entire bottle this time or only half?