Normally I leave the camera on auto white balance, and then play with custom white balance in raw. I was processing my fireworks pictures, and it occured to me I dont know what to set it to, other than what looks good to me. Is there a certain color temperature you use for fireworks? Also, I did a 3 minute and 4 mintue exposure of the valley the fireworks were being held before the fireworks were going off, and im not sure what white ballance to use for that either. I just played with it to get something interesting to me, but perhaps theres a white balance that is normal for this sort of thing.