I brought some colored hair dye on amazon (
http://www.amazon.co.uk/gp/product/B0025SVCIY/ref=oh_details_o00_s00_i00) and when I used it it had absolutely no effect on my hair. I looked at the comments and someone says you have to put it on dry hair, BUT in the instructions it says wet hair, so it is their fault, not mine. Should I send them a message? I would like to try again on dry hair, but I feel I wasted my money, and seeing as it's their fault I think I would be entitled to a free hair dye. What do you think?