VSCO FILM 03: Why do some of the films have a "Negative" version? What does that mean?

All of the professional peel-apart type films create a negative of the image on the "goo" side that the positive gets removed from. Usually this portion just gets thrown away, but a few of the films have a negative that can actually be scanned and used if they are treated in certain chemicals. The negative presets are based on the looks these films have once scanned, inverted and color-corrected.