Abney, William de Wiveleslie, Sir, 1843-1920, author · London : Macmillan and Co. · leaf 9
PHOTOGRAPHY. 7 or, as it is now called, a negative. Such a blackened paper with the white image on it could be used to cover a second piece of sensitive paper, which on exposure to light would show the lace as black on a white ground ; and this he termed a positive picture. ISTote the advantage of… … producing silver iodide by the direct contact of the metal with the halogen ; but the same results can be obtained by chemical decomposition. Silver iodide may be precipi- tated by mixing a solution of potassium iodide with silver nitrate.1 This was the method adopted by Tox Talbot in the calotype…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
