BS 3540 62nd Edition, September 12, 1962
Specification for the identification of the emulsion side of edge-marked roll film for still picture cameras
Includes all amendments and changes through Reaffirmation Notice , October 15, 1978
Additional Comments: W/D S/S BY BS ISO 897
Published By:British Standards Institution (BSI)
Specifies a means of identifying the emulsion side of roll film and 35 mm film, for still picture cameras, which carry edge markings. The disposition of these edge markings (letters, figures or arrows) provides an easy means for identifying the two sides of the film.