Abstract
Polaroid color photography is based on integral tripack coatings in which each emulsion layer is associated with a dye-developer layer. On development, the chemicals being supplied from a pod, the unused dye developer diffuses to a receptor layer, where the color picture is formed; the oxidized developer is immobilized. A timing layer over an acid polymer layer ensure that pH is high initially for development and then drops. In the integral form (SX-70) opacification shields the light-sensitive layers; the indicator dyes used for this are decolorized by the drop in pH.
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References
Land, E.H.: Photogr. J. 114, 1 (1974); Photogr. Sci. Engng. 16, 347 (1972); US Pat. 3415644 (1968)
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Rogers, H.: US Pat. 2983606 (1961)
Land, E.H.: US Pat. 3647437 (1972)
Land, E.H.: US Pat. 3362819 (1968)
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Berg, W. Polaroid one-step color photography. Naturwissenschaften 64, 1–7 (1977). https://doi.org/10.1007/BF00439885
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DOI: https://doi.org/10.1007/BF00439885