I heard that semi permanent color can only darken your hair but it can't lighten it, is this true? My hair is off black/darkest brown with a reddish tint. If I use a semi permanent color that's lighter than my hair, will it dye effectively and be that color?
if you have dark hair, and want to lighten it up, you should bleach it. there is no way to go from a dark brown, to a blond. unless you go from the dark brown, to a bit lighter one, and so on, until you reach to the color that you wanted.
I have black hair and I tried dying my hair before with a lighter color but it wasn't very effective. It was barely noticable in the sunlight. I think if you want to get a lighter color, you have to bleach it.