if the colour you want to dye your hair is lighter than the colour it is now then no. if your hair is lighter it will work but the results may be unreliable and the colour may be hard to remove. hope this helps xXx
i dyed my hair dark bron, but i want it to go darker so im using a black wah out hair dye that washes out in 3 washes. it might be better if it stays in longer, because 3 washes isnt that much! it probobly wont go black though, i tried the shaders and toners dark brown before i dyed my hair at all, and it didnt work 1 bit! im hopong this one will