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: (ferric 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 External links Kodak: Processing Kodachrome film K-14 Process Demonstration Photographic film processes