Part I The Science of Photography
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Introduction
Chapter I.
Historical Sketch of Photography
Chapter III On the Development of an Invisible Image
Simple experiments illustrating the process
Section I.—Chemistry of the Substances, employed as Developers.—Development shown to be a process of reduction.—The chemistry of the principal reducing agents, Gallic Acid, Pyrogallic Acid, and the Protosalts of Iron
Section II.—The Reduction of Salts of Silver by Developing Agents.—Reduction of Oxide of Silver—of Nitrate and Acetate of Silver.—Varied appearance of Metallic Silver when finely divided.—The reduction of the Iodide and other Salts of Silver containing no Oxygen
Section III.—Hypothesis on the Formation and Development of the Latent Image.—Explanation of the terms under- and over-exposure.—Diagram of Molecular change.—Moser’s experiments on development.—Curious perversions of development