Poke around the camera's settings looking for a White Balance option. Might just be labeled "WB" or with an icon of two triangles pointing at each other with a rectangle between and above them, like this: http://files.pressible.org/20/files/...lance-Icon.jpg
In a nutshell, you point that at something white that's in the same light as what you want to photograph (so get close and point the camera at your downtube) then press the button. The camera then knows you want that to be white so it adjusts its colors to cancel out whatever is messing with your colors.
If you can't do a manual white balance like this, perhaps just picking the type of light (direct sun, shade, incandescent, fluorescent, whatever) would help with your colors.

Robbie, as soon as I find my camera I'll have shots of my '85 and '86 Ironmen for you. Paint on both isn't in spectacular condition but I've always been impressed with how many original parts they still have. Friend of mine has an '89 with the white-and-marbled paint job too, don't remember whether it's an Expert or Master.