If film is developed without being exposed to light, the resulting images or negatives will typically appear blank or completely black. This is because the film's photosensitive emulsion, which is responsible for capturing and recording light, has not been exposed to any light during the process.
When film is exposed to light, the photons interact with the emulsion, causing a chemical reaction that results in a latent image being formed. During development, this latent image is processed to produce a visible image on the film. However, in the absence of any exposure to light, there won't be any latent image formed, and the development process will not produce any visible result.
It's worth noting that certain types of specialized films, such as infrared-sensitive film, can capture light outside the visible spectrum. These films require specific filters and techniques for proper exposure and development. However, the general principle remains the same: if a film is not exposed to any light, it will not produce a visible image when developed.