EXPOSED FILM ROLL: 1.5M Strip

EXPOSED FILM ROLL: 1.5M Strip

•  Any form of spool-wound photographic film shielded from white light exposure by a paper covering is referred to as an exposed film roll.
•  The phrase originally meant the opposite of sheet film.
•  Because of its resemblance to a shotgun cartridge, roll film was first sometimes referred to as "cartridge" film, which is confusing
•  Learning Outcome GCSE Biology - The Effect of pH or temperature on Trypsin.
•  Supplied as 1.5M strip.

(Wikipedia excerpt: ..."Photographic film is a strip or sheet of transparent film base coated on one side with a gelatin emulsion containing microscopically small light-sensitive silver halide crystals. The sizes and other characteristics of the crystals determine the sensitivity, contrast, and resolution of the film.[1] Film is typically segmented in frames, that give rise to separate photographs.[2]

The emulsion will gradually darken if left exposed to light, but the process is too slow and incomplete to be of any practical use. Instead, a very short exposure to the image formed by a camera lens is used to produce only a very slight chemical change, proportional to the amount of light absorbed by each crystal. This creates an invisible latent image in the emulsion, which can be chemically developed into a visible photograph ...")

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