Abstract
So far as I am aware, there is no evidence in the literature that the compounds of any element, other than silver, possess the property exhibited by silver halides of recording an invisible—and chemically undetectable—latent image under the influence of light, such image being afterwards convertible into a visible image by suitable processing. Experiments which I have recently made with emulsions of thallous bromide in gelatine have conclusively shown that thallous bromide is also capable of receiving a latent image. Direct reduction of the exposed thallous bromide to yield an image in metallic thallium is not possible, the most powerful reducing solutions being without effect. But by bathing the exposed thallous bromide in silver nitrate solution a double decomposition takes place, the thallium in the emulsion being replaced by silver without destruction of the latent image; after washing out the excess of soluble silver, the plate can be developed and fixed in the same way as any ordinary photographic plate.
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FARRER, W. Detection of a Latent Image in Thallous Bromide. Nature 137, 276 (1936). https://doi.org/10.1038/137276a0
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DOI: https://doi.org/10.1038/137276a0
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