I have dirty blonde hair which has some natural highlight. I use Sunin spray when ever I feel like freshening up my look. It is probably not the bestt thing for my hair but the again, using any boxed dyed to lighten my hair are probably going to do the same thing. People say it turns their hair orange but I think the key is to use only a little bit and use it gradually. Really just 1- 2 sprays on your head every couple of weeks. Also if you have undyed hair and especially if you have dirty brown/ blonde hair this probably wont turn it orange!