Polaroid metallized dyes

Polacolor. The first instant color film, Polacolot, was introduced by Polaroid Corporation in 1963. Polacolot was replaced in 1975 by Polacolot 2, a film with improved light stabiUty, which utilizes the metallized dye developers shown in Eigute 4. An extended range version, Polacolot ER, introduced in 1980, utilizes the cyan and yeUow metallized dye developers together with a magenta dye developer that incorporates a xanthene dye having reduced blue absorption (see Eig. 5). 

Instant photography (e.g. of the Polaroid type) also relies indirectly on the silver halide process but here the reduced Ag (metallic silver) acts as a reducing agent to modify the solubility properties of a dye. The dye is linked covalently to a molecule such as a quinone (Figure 6.5), which is insoluble in water. When this is reduced to hydroquinone, it becomes soluble in alkaline solutions. The principle of this photographic process is the following ... 

To improve the light stability of the original Polacolor film, Polaroid introduced a metallized set of image dyes in 1972. This set included a chromed azomethine yellow 44, a chromed azo magenta 45, and a highly solubilized derivative of copper phthalocyanine 46 [60],... 

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