Dye and Mehndi

Q: I have a hair dye, but I don't know whether the hair dye is porous or not. Please tell me how to know whether a hair dye is porous or not?

Q: I wanted to color my hair to brown, is it permissible to do so? I read on islamqa.info that it is permissible, but is it really the case?

Q: I am a twenty years old. Since January I have a disease. Now I am recovering. My question is that this disease has caused my hair to turn white before age. I know that it is haraam to pluck white hair and also that one falls in Allah's eyes by doing such deeds. But I have also heard that young muslims can even dye their hair black if they wish. I want to ask that is it permissible to pluck such white hair that are growing before age and are a result of a temporary disease?

Q: I have heard that applying mehndi (hena) before eid (on the night of eid) is sunnah and will you get reward for applying it on hands and feet. Is this true according to Islam? If someone don't apply for eid or before eid, are they committing a sin? Will they get punished for it?

Q: Can a male dye his hair red or blue or any other colour besides black?

Q: Is is permissible for a man to have  mehndi on his hands. Please give reference from Quran and Ahaadith.

Q: I want to know all the rules for colouring the beard. Can I make it red or black?

Q: Is it permissible for a Muslim lady to tint her hair for her husband only?

Q: Can women apply henna on their hair?

Q: Can women dye their hair?