Recently I have been having trouble with the ends of my colored hair turning a pinkish color when I use a curling iron. Thinking it was the curling iron needing cleaning I did so and the problem stopped. Yesterday I bought a new iron and the problem started again. The only other thing I did the first time ande yesterday was use a thermal styling spray when curling my hair. This is so annoying and I can't find the cause of this. Please help and thanks. Joanne Burns