Really, no matter what format you're shooting with a D100, you need to do your WB every time the light changes.
I promise you. It does really work.
And I'll try to shoot something red with my 10D and see what happens.
--
Emily L. Ferguson
mailto:elf@xxxxxxxx
508-563-6822
New England landscapes, wooden boats and races, press photography http://www.vsu.cape.com/~elf/