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Process is the Last Refuge of a Scoundrel
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::2014/04/01::
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Scrapbook Layout in Process: Home is Wherever I'm With You
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From Wikipedia, the free encyclopedia
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K-14 was the developing process for Kodak's Kodachrome transparency film; the last version having been designated Process K-14M. [1] The process differed significantly from its contemporary, the E-6 process, in both complexity and length. Kodachrome film has no integral color couplers; dyes are produced during processing (each color in a separate step) by the reaction of the color couplers with the oxidised developer. Due to declining sales, Kodak discontinued production of all K-14 chemistry in 2009, concurrently with Kodachrome 64 film. Dwayne's Photo, which operated the last K-14 line in the world, discontinued sales on December 30, 2010; the last roll was processed on January 18, 2011. At least one group of photographers has been assessing the possibility of recreating a K-14 line using orphaned hardware and new chemicals.[citation needed]

Steps[edit]

The layers in the film are, top-to-bottom: blue sensitive (yellow), yellow filter, blue-green sensitive (magenta), blue-red sensitive (cyan), acetate base, rem-jet antihalation backing.

The processing cycle is as follows:[2]

Backing removal
An alkaline bath softens the cellulose acetate phthalate binder. A spray wash and buffer removes the rem-jet antihalation backing.
First Developer
All exposed silver halide crystals are developed to metallic silver via a PQ developer. The yellow filter layer becomes opaque because it has a combination of Lippmann emulsion (very tiny grains) and Carey Lea silver (metallic silver particles that are small enough that they are yellow rather than gray.)
Wash
Red light re-exposure through the base
This makes the remaining undeveloped silver halide in the cyan layers developable.
Cyan developer
The solution contains a color developer and a cyan coupler. These are colorless in solution. After the color developer develops the silver, the oxidized developer reacts with the cyan coupler to form cyan dye. The dye is much less soluble than either the developer or the coupler so it stays in the red layer of the film.
Wash
Blue light re-exposure from the top
This makes the remaining undeveloped grains in the blue sensitive layer (the yellow layer) developable. The now opaque yellow filter layers prevents the blue light from exposing the magenta layer (the green sensitive layer, which is also sensitive to blue light). It is important to avoid stray printing light exposing the film base of film.
Yellow developer
Analogous to the cyan developer.
Wash
Magenta developer
This contains a chemical fogging agent that makes all of the remaining undeveloped silver developable. If everything has worked correctly, nearly all of this silver is in the magenta layers. The developer and magenta coupler work just like the cyan and yellow developers to produce magenta dye that is insoluble and stays in the film.
Wash
Conditioner
Prepares the metallic silver for the bleach step.
Bleach
(Iron EDTA) Oxidises the metallic silver to silver halide. The bleach must be aerated. The former ferricyanide bleach did not require aeration and did not require a conditioner.
Fix
Converts the silver halide to soluble compounds which are then dissolved and washed from the film
Wash
Washes the fixer out of the film.
Rinse
Contains a wetting agent to reduce water spots.
Dry

The result is three different color records each with the appropriate dye, just like other color films. The original Kodachrome process in 1935 used dye bleaches and was a far more complex process. 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.

References[edit]

  1. ^ "Processing Steps - Processing Kodachrome Film (PDF)". Eastman Kodak Company. 2000. Retrieved 1 March 2009. 
  2. ^ "Process K-14 sequence with crossections" (pps). 

External links[edit]

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