What temperature should the water be to mix henna? I used to use very warm water when using tea bags. Today I used room temperature water with lemon to mix my henna. I recently read on a link placed in one of the threads here of a woman who uses very hot water to mix her henna but I've also heard that hot water isn't good for henna. Does it matter the temperature of the water used to mix henna? I was always afraid to use lemon because I heard it makes the hair very dry but decided to give it a chance anyway. The only obvious downside I can see is waiting hours and hours for the henna dye release, tea only takes a few hours. Are there specific benefits to using lemon?