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Instant films with different view and expose sides had, as seen from the view side, from the front towards the back of the film, in layers: A backing layer, a clear polyester layer, a mordant to receive the image in the film, a titanium white light reflecting layer, a carbon black opaque layer, a releaser for the cyan dye, an emulsion sensitive ...
The film may be soaked in water to swell the gelatin layer, facilitating the action of the subsequent chemical treatments. The developer converts the latent image to macroscopic particles of metallic silver. [3] A stop bath, [a] typically a dilute solution of acetic acid or citric acid, halts the action of the developer.
The name "redscale" comes because there is a strong color shift to red due to the red-sensitive layer of the film being exposed first, rather than last [the red layer is normally the bottom layer in C-41 (color print) film]. All layers are sensitive to blue light, so normally the blue layer is on top, followed by a filter. In this technique ...
Time Zero was the film manufactured up until 2005, though overseas-market and some last run film packs were marked only as SX-70. A feature of the SX-70 film packs was a built-in battery to power the camera motors and exposure control, ensuring that a charged battery would always be available as long as film was in the camera.
Fuji's instant film products are based upon the improvements made to Polaroid's SX-70 instant film system that the Eastman Kodak Company sold in the 1970s and 1980s – namely the ability to expose the film through the rear of the photograph and the reversal of the dye layers' order so that development in the blue layer is visible first.
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The film itself integrates all the layers to expose, develop, and fix the photo into a plastic envelope commonly associated with a Polaroid photo. The Polaroid SX-70 was the first camera to use this film. Improvements in SX-70 film led to the higher speed 600 series film, then to different formats such as 500 series (captiva), and spectra.
Polachrome film in 135 cartridge and processing pack case. In 1983, Polaroid introduced an "instant" transparency system for still photography. Each roll of 35 mm film came with its own small packet of processing chemistry. After exposure, the film and its packet were loaded into a small hand-cranked machine called an "AutoProcessor".