It won't remove it - the semi will need to wash out or fade over time. It will cover over it, but the end result may not be the one on the box as you will not be dying natural hair.
The permanent color should cover the semi permanent one, if dark enough. But, yes, eventually the semi permanent color will fade away.
Semi permanent colour will wash out in 6-8 weeks.
yes, semi-permanent does not have harmful chemicals like permanent dye, I do it all the time.
Do you mean pastel hair dye? It depends on if you use a permanent dye or a semi-permanent. Semi-permanent hair dyes will wash out and fade over time; permanent hair dyes will stay in the hair until you cut it or dye it another color.
Well its not permanent, so it should wash out in a few washes. Or what ever it says on the hair dye box.
No it does not. ___________ But temporary color does. It can be removed with just water.
Yes
Of course you can. Semi permanent dye simply adds color to your hair. A permanent will actually cause your natural color to change. But remember this... color doesn't lift color. Therefore if your semi permanent hair color is darker than the permanent color you are going for---- it isn't going to work. You need to use a color remover before hand. And color removers are REALLY damaging to hair.
yup
It can if you have not washed the excess dye out fully, or if your hair is very porous and has trouble retaining color.
yes, however it has to be a darker shade. Semi permanent dye will never lighten your hair so you can use it to go darker but not lighter.
yes, however it has to be a darker shade. Semi permanent dye will never lighten your hair so you can use it to go darker but not lighter.