35 mm slides
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35 mm slides came on film rolls of the same size and shape as 35 mm negatives, designed to fit the same cameras, but the pictures on them came out "positive" instead of "negative" so that they could be projected directly from the film onto a screen.
For many years (from 1935 to 2009), Kodachrome was a very popular brand of color slide film, memorialized in song. Alas, like Paul Simon's mom, Kodak did eventually take Kodachrome away, discontinuing the film in 2009. On December 30, 2010, the last photo lab in the world with the capacity to develop Kodachrome (requiring special processes and chemicals not found in normal photo labs) ceased this service.