I think you get his idea wrong.Originally Posted by denniskee
If a room a fluorescent balance, you shoot with color film, without flash, you need to balance for fluorescent light with filter use on camera. The filter will be magenta base to compensate for green cast.
If in the same situation, you shoot with color film with flash and mix with fluorescent light as ambient, you need to use magenta filter on camera lens, and green filter on flash. Why? Because since you balance for fluorescent light, you also need to covert you flash to fluorescent light balance, if not the flash light will turn out too magenta on film.
Anyway, the TS is asking about shooting film, and without using flash, I believe he already has the answers.
Hope this is not too confessing to other.