Ektachrome
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Ektachrome is a brand name owned by Kodak for a range of transparency, still and motion picture films previously available in many formats, including 35 mm and sheet sizes to 11 × 14 inch size. Ektachrome has a distinctive look that became familiar to many readers of National Geographic, which used it extensively for color photographs for decades in settings where Kodachrome was too slow. In terms of reciprocity characteristics, Ektachrome is stable at shutter speeds between ten seconds and 1/10,000 of a second.
A box of Ektachrome 64T in 120 format, late 90's European package, expired December 2001
Kodak Ektachrome F 35mm Slide Film, E-2 Process, Expired: February 1963
Kodak High Speed Ektachrome 35mm Film (Expired: 1970s)
Kodak Ektachrome 100 35mm Slide Film
E-6 process
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The E-6 process is a chromogenic photographic process for developing Ektachrome, Fujichrome and other color reversal photographic film.
An example of slide film requiring development using the E-6 process
An example of processed slide film showing a positive image
The E-6 process results in positive images that can be mounted and presented as slides