Flame changes ink color!

I noticed another thing today... When I was burning a few scraps of paper with typed letters on them I noticed that in the ashes that remained, if you could still see the words, most of the words had turned orange! I tried it again, as I thought maybe it had been orange in the beginning and I just hadn't noticed... but it still turned orange! When you think of fire, you usually think of orange or yellow and that's the color of the fire from my lighter. I wonder, if I burned the paper with blue flame, would the letters have turned blue...?