A notch code is a set of notches or recesses cut into the edge of a piece of

sheet film Sheet film is large format and medium format photographic film supplied on individual sheets of acetate or polyester film base rather than rolls. Sheet film was initially supplied as an alternative to glass plates. The most popular size measure ...

to provide a tactile way to identify the film brand, type, and processing chemistry (e.g. black and white, color negative, or color reversal) in the dark. It enables photographers to identify the emulsion side of the film when loading sheet film holders, and helps processing lab technicians avoid placing sheets in the wrong processor. After processing the notches serve as a permanent visual record of the same information. When the film is oriented vertically (portrait format), the notches are in the top edge near the upper right corner when the emulsion faces the viewer.

Code notches and ISO speeds for Kodak sheet films

Code notches and ISO speeds for Ilford sheet films

Code notches and ISO speeds for Fuji sheet films

Historic Notch Codes

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Sources

* Note 31.3 of the

RIT Rit is a brand of dye A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color. Dye is generally applied in ...

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Kodak Tech Pub F3
* ''Kodak Technical Publication P7-4A: Reference Data for Kodak Professional Photographic Products''.
More film notch codes.
* Kodak information on Plus-X Pan Professional with correct notch code http://www.kodak.com/global/en/professional/support/techPubs/f8/f8.pdf

References

Photographic film markings