VSCO FILM 03: Why do some of the films not have both a cold and a warm version?

The expired Polaroid Time-Zero is a perfect example of this. Because it was expired, it created a very strong orange look even at cold temperatures. Since the "normal" and the cold versions were both so orange, a warm version would have been so orange as to be unusable, so it was not made. Polaroid 669 is another example, where the film is very cool and blue looking in general, and a "warm" look was never really achievable. Fuji FP-100c is quite remarkable, and we were barely able to coax any dramatic difference out of it with temperature changes, so only a slightly cooler alternate set was made.