Abstract
WHEN, forty years ago, Mungo Ponton discovered that a sheet of paper, moistened with a solution of potassium dichromate, became darker when exposed to the rays of the sun, he made the first of a series of experiments which have led to the discovery of a method of rendering photographic pictures as permanent as engravings made in printing ink, though the completion of the work to a point at which it could fairly be said to be capable of competing with the well-known silver chloride print was not made till nearly thirty years afterwards, when Swan, by an admirable series of inventions, made it a practical means of producing prints.
A Manual of the Carbon Process of Photography, &c.
By Dr. Paul E. Liesegang. Translated from the German by R. B. Marston. With Illustrations. (London: Sampson Low, Marston, Searle, and Rivington.)
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F., R. A Manual of the Carbon Process of Photography, &c. Nature 19, 362 (1879). https://doi.org/10.1038/019362b0
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DOI: https://doi.org/10.1038/019362b0