K-14 process

[3] Due to declining sales, Kodak discontinued production of all K-14 chemistry in 2009,[4] concurrently with Kodachrome 64 film.

Dwayne's Photo, in Parsons, Kansas, operated the last K-14 line in the world, discontinued sales on 30 December 2010;[5][6][7] the last roll was processed on 18 January 2011.

[8] The cross-section of Kodachrome film consists of layers which are, from top-to-bottom: blue sensitive (of which the non-sensitized portions will be dyed yellow), yellow filter, blue-green sensitive (dyed magenta), blue-red sensitive (dyed cyan), acetate base, rem-jet anti-halation backing.

The original Kodachrome process in 1935 used dye bleaches and was a far more complex process; the dyes themselves were unstable and faded at high temperature.

Although the formulae have changed over the years, the basic process steps have followed a similar pattern since the introduction of "selective re-exposure" Kodachrome in 1938.