I'm a noob photographer and I never gave white balance any thought. But when I use color print film for snapshots and shoot indoors in tungsten light, everything is orangey. Under fluorescent light sometimes it's greenish. I've come to realize that maybe you can cancel these things out with filters, if you were willing to sacrifice the speed, but I've never tried, since I have no filters. What are the most useful color filters and what kind of situations should they be used in, or what kind of effects can you get? I've heard about people that use yellow filters with B&W too, because it supposedly increases contrast.