Fire is a tricky one
Reds, oranges, yellows and whites for sure.
Unless its some sort of chemical fire; they can be all kinds of colours e.g. Potassium burns pink/purple when in contact with water.
It also depends if you want it to look real, or fantasy.. what I mean by that, is us hobbyists have a habbit of highlighting fire backwards, with the whites and yellows on the flames tips (which are actually the coolest parts of the flame and should be orangey red)