Yes. The color will develop slightly lighter than the color on the box or hair swatch.
yes it is safe to dye a child's hair because i know many kids that had it done and they are fine
Any hair dye with 20 volume developer or higher is permanent.
yes
All hair dye is potentially damaging. If you colour & maintain your hair properly, yes, it can be bad.
You use 20 volume to cover grey hair.
No.
It largely depends on the volume of the hair, but in general, about 12-15 cc hair dye per square inch of hair.
depends how thick your hair is !!
It depends if you bleach it or not and what volume of bleach and what type of dye you put in your hair. If it is bleached on a high volume, then your hair will in some way, be damaged. For some people, if you dye it, you will lose your natural color.
yes
No,I don't think it's safe!
Yes, it is safe to dye your hair again after bleaching and toning it. However, you may want to give your hair some time to recover from the last treatment before dying it again.