Ok so for this show I'm in I need to have Brown hair. My hair is a light blonde. It is in good condition as I cut it regularly and I avoid using heat on my hair but my hair is quite thin. The Brown would be quite dark. Anyway, I've been told by a lot of people that it won't work and my hair won't go back to the same colour afterwards. Any advice? Thanks in advance :)

If it's just for a show and then you want your hair back to it's natural color, you should very seriously consider just getting a wig.