WHILE many materials are sensitive to light and can be used for making photographs, the present art of photography is based upon one specific process: the light-sensitive material is silver bromide in the form of extremely small crystals held in a layer of gelatin.
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MEES, C. RECENT ADVANCES IN OUR KNOWLEDGE OF THE PHOTOGRAPHIC PROCESS*. Nature 150, 720–723 (1942). https://doi.org/10.1038/150720a0