Kodak Plus-X Pan
One of my longtime questions from when I first began pursuing photography has been "why was it called Safety Film"?
From what I can find out, it seems as if film was flammable prior to 1948 when Kodak announced a 35 mm tri-acetate safety base film for the motion picture industry to replace the flammable cellulose nitrate base film.
Plus-X, a fine grain Black & White ISO 125 film, was usually my choice over the super fine grain Panotomic-X and the Super-XX (To be replaced with Tri-X in 1954).
One of the greatest treats for me to add to my collection of photography memorabilia was the addition of these two film canisters. The great thing about this find was the film was still in the canisters. They were color coded to match the film speed color scheme in Kodak's packaging. The brown was Plus-X and the green was for Super-XX.
I would assume that the movie industry had a large influence in Kodak's development of "Safety Film" since there was concern over the archival life of movie films or if exposed to heat or other excess temperatures.
I guess today's films are by default a "Safety Film" and no longer need the disclaimer on the box. Although I am not going to expose these two rolls, I will certainly keep them safe in my collection.