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| collodion process | |
|---|---|
| Name | Collodion process |
| Invented | 1851 |
| Inventor | Frederick Scott Archer |
| Medium | Photographic glass plate |
| Notable users | Mathew Brady; Julia Margaret Cameron; Roger Fenton |
| Country | United Kingdom |
| Period | 19th century |
collodion process The collodion process is a 19th-century photographic technique that uses a nitrocellulose solution coated onto a support to form light-sensitive silver halide layers, producing negatives or direct positives. Developed in the United Kingdom and rapidly adopted across Europe and North America, it transformed portraiture, reportage, and scientific imaging during the Victorian era. Its applications touched studio portraiture for royalty, battlefield documentation for military campaigns, and ethnographic studies in colonial expeditions.
The collodion process emerged amid photographic innovation involving figures such as Frederick Scott Archer, William Henry Fox Talbot, Louis Daguerre, Nadar, and Mathew Brady, reshaping practices from the Calotype and Daguerreotype eras. Early adoption spread through workshops in London, Paris, New York City, and Rome, influencing practitioners like Julia Margaret Cameron and Roger Fenton during events including the Crimean War and the American Civil War. Patent debates implicated inventors and publishers across industrial centers such as Manchester and Glasgow while professional societies like the Royal Photographic Society and exhibitions at the Great Exhibition facilitated dissemination. By the late 19th century, the collodion process gave way to gelatin dry plates developed by innovators in Berlin, Chicago, and Geneva, but it left a legacy evident in visual records of figures such as Queen Victoria, Abraham Lincoln, Ulysses S. Grant, Florence Nightingale, and explorers like David Livingstone.
The recipe centers on nitrocellulose dissolved in ether and alcohol to form collodion, combined with silver nitrate and halide salts (iodides, bromides) supplied by chemists working in laboratories akin to those of Augustin-Jean Fresnel, Justus von Liebig, and industrial suppliers in Lyon and Leipzig. Light sensitivity derives from silver halide emulsions precipitated within the collodion film, whose chemistry was refined by experimentalists influenced by analytical methods from Robert Bunsen and Michael Faraday. Variations employed potassium iodide, cadmium bromide, and ammonium nitrate reagents produced by firms in Birmingham and Plymouth. Safety concerns over volatile solvents and explosive nitrocellulose connected practitioners to regulatory discussions in municipal authorities of London and port cities handling ether and alcohol imports.
Variants include the wet collodion negative, the ambrotype (collodion positive on glass), and the tintype (ferrotype) using blackened iron plates marketed in workshops across Boston, Philadelphia, and San Francisco. Hybrid techniques blended collodion with albumen prints popularized in studios of Paris and Vienna. Experimental formats ranged from lantern slides for scientific societies like the Linnean Society to large-format panoramas used by surveyors employed by institutions such as the U.S. Geological Survey and expeditions sponsored by the Royal Geographical Society.
Practitioners used wooden or brass field cameras similar to models supplied by makers in Kensington and Sheffield, silver nitrate baths produced by chemical houses in Hamburg, and portable darkrooms aboard riverboats and caravans on expeditions to regions controlled by colonial administrations linked to India Office and British East India Company legacies. Technique required coating glass, sensitizing, exposing, and developing before the collodion dried, demanding coordination comparable to orchestration in studios frequented by sitters such as Charles Darwin, Karl Marx, and Oscar Wilde. Accessories included collodion knives, plate holders, and tannic-acid varnishes used by photographers operating in ateliers near Covent Garden and Montmartre.
Images produced by collodion exhibited high resolution and fine detail prized by portraitists photographing subjects like Queen Victoria, Louis Napoleon, and Frederick Douglass. The tonal range favored sharp highlights and subtle midtones sought by pictorialists influenced by aesthetics from John Ruskin and Gustave Le Gray. Collodion positives and negatives demonstrate distinctive surface qualities evident in museum collections from institutions such as the Metropolitan Museum of Art, the National Portrait Gallery (London), and the Getty Museum. Tintypes and ambrotypes provided durable field records used in documentation of events like the Siege of Sevastopol, the Gettysburg Campaign, and polar expeditions led by Ernest Shackleton.
Conservation of collodion artifacts engages curators at the Smithsonian Institution, the British Museum, and national archives in Canberra and Ottawa, addressing issues of delamination, silvering, and solvent residues. Stabilization strategies draw on protocols from conservation laboratories at universities such as Harvard University and Yale University, with treatment histories documented by professional bodies including the International Council of Museums and the American Institute for Conservation. Storage recommendations reference controlled environments in repositories like the National Archives and special collections at the Library of Congress.
The collodion process influenced visual culture through practitioners including Mathew Brady, Alexander Gardner, Roger Fenton, Julia Margaret Cameron, Nadar, Felice Beato, Henry Fox Talbot-era successors, and studio operators in capitals like Rome and Istanbul. Their images shaped public perceptions of leaders such as Napoleon III, Abraham Lincoln, Bismarck, and cultural figures including Charles Dickens, George Eliot, and Edgar Allan Poe. Collections and retrospectives at institutions like the Victoria and Albert Museum, the National Gallery of Art, and the Tate Modern continue to study the collodion corpus for its role in reportage, colonial encounter imagery, and the emergence of commercial photography through studios and carte-de-visite enterprises in cities such as Leeds, Bordeaux, and Sydney.
Category:Photographic processes