All the film photography I know of - both colour and black-and-white - uses silver halide as the photosensitive component. I suppose that after over a hundred years of wet photography we have a good understanding of the options. But, if for some reason silver halides could not be used for film photography, what would the second (or third) choice be? How does it differ? Are/were the alternative options actually in use - and if so, what for?
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Alkali earth metals have some photosensitivity. Not nearly as good as AgX, though. I'm assuming you realize that silver halide is not a single material, but refers to silver in combination with any of the halides: fluoride, chloride, bromide, iodide. Usually alternative processes use various combinations of these. |
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Very nice article on the history of film chemicals and film stock. http://www.lensrentals.com/blog/2012/04/exploding-photographers-disappearing-clothes-and-the-development-of-film |
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