Code notch
Individually distinctive notches located near one corner on photographic sheet of film for product identification purposes. When viewed correctly, these code notches will appear at top-left corner or bottom-right corner of the sheet.
So, here it is, in glorious photographs - just what to expect when you open the box, how to tell which side is the emulsion side (without the hopeless description "Film code notches in the upper right corner").
Emulsion Side: In photography, the side of the film coated with the silver halide emulsion which faces the lens during exposure. It is the most susceptible to scratches. In photographic sheet film, there is usually a code notch indicating what ...
 See also: Slide, Lens, Image, Notch, Back
  
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