Let's see I used to try different methods to re-colour hair in psp7 should work in psp 8 (which I have and rearely use LOL). One is a layer over the hair flood filled with a colour and then set to "Hue" or "colour" The other is that I never used the "colorize" option makes hair look too flat I use the Hue/Saturation/Lightness instead.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo