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| Collodion negative |
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A sheet of glass hand-coated with a thin film of collodion (guncotton dissolved in ether). This contains potassium iodide and is sensitised on location with silver nitrate. For maximum sensitivity, the plate had to be exposed while still wet and developed immediately. Introduced in 1851 by F. Scott Archer, the process gave a high resolution of detail. Dry collodion negatives, introduced later, were made by covering the collodion with a layer of albumen or gelatin. |
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