Want this question answered?
yup
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.
Manic Panic hair dye is a semi-permanent dye and only lasts for 2 - 6 weeks.
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.
Semi permanent colour will wash out in 6-8 weeks.
yes
The permanent color should cover the semi permanent one, if dark enough. But, yes, eventually the semi permanent color will fade away.
Semi-Permanent hair dyes usually last from 4 to 6 Shampoos.
yes, semi-permanent does not have harmful chemicals like permanent dye, I do it all the time.
Maybe, it should work. But be carefull it could go out wrong
It can if you have not washed the excess dye out fully, or if your hair is very porous and has trouble retaining color.