![]() The collodion photographic process was a wet place process, which meant that the glass plate itself had to be wet while it was exposed and throughout processing. While the first process to take advantage of glass plates was an albumen print, it was quite laborious and quickly surpassed by the collodion glass plate negative in common use. Collodion glass plate negative: This process was invented by the Englishman Frederick Scott Archer in 1851.Processes Įarly wet plate collodion portrait of lady Glass plates as a form of support were popular in use between 1851 and the 1920s. ![]() This negative image can then be used over many years to produce paper positives. The fix bath will ensure that the remaining silver halide crystals are no longer sensitive to additional light exposure, removing all excess. An important part of the photographic process, " fixing," is then used to wash the silver particles that are not part of the image, which then produces a stable negative image. In the case of the Wet Plate Collodion, the image is run under a wash bath to stop the development of the image after exposure. This is extremely important with the conservation and restoration of photographic plates because it helps the conservator prevent further chemical reactions. Depending upon the time period, there can be variants to the binder and thus, the chemistry of the image. This emulsion layer sits upon what is called the support, which can be paper, metal, film, or as in the case of photographic plates, glass. Combined with the image substance, these two elements make-up what is called the emulsion. In general, black and white photographic negatives are made up of fine silver particles, (or color dyes for color negatives), which are embedded in a thin layer called a binder. Glass plates emerged as a common support medium for photographic negatives in the mid-nineteenth century. Photographic plates consist of an image layered on a glass support. This practice includes understanding the composition and agents of deterioration of photographic plates, as well as the preventive conservation and interventive conservation measures that can be taken to increase their longevity. It covers the necessary measures that can be taken by conservators, curators, collection managers, and other professionals to conserve the material unique to photographic plate processes. The conservation and restoration of photographic plates is the process of caring for and maintaining photographic plates in order to preserve their materials and content.
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