I've often wondered this. I realise henna itself is a red base but I mean more the method and result than the dye base if that make sense?! As in, something I can put on my slightly dull blonde hair that will make it brighter and golden without bleaching it? That is also fairly generic rather than me trying to figure out what colour my hair is and then match it on a box so I can figure out what colour I want it to be. As I'm truly crap at that.