Hair and Nails

Removing pubic hair

Q: When it comes to removing the hair from the private parts, there is a natural line from where the private parts start below which all hair is to be
removed. My question is does the hair between the naval and the natural line need to be removed?

Hair dye

Q: Is it permissible to use permanent hair dye? Does it allow water to sink into the skin or does it just sit on the hair like a coating? Also if the hair dye contains alcohol, can I use it and then wash it out?