![]() The paper concludes with a discussion of the reformatting of glass plate negatives and the use of scanning and digitization as a means to create preservation and user copies. The paper then discusses handling techniques (including retrieval) as well as common conservation concerns including the chemical breakdown of the glass, appropriate ways to deal with broken and cracked glass and the problem of image separation from the glass. The paper then explores the storage of glass plate negatives including current research on their ideal physical environment, shelving and the use of enclosures and sink mats. This paper begins with a brief overview of the history of glass plate negatives beginning with their invention in the mid-nineteenth century and their usage through the first quarter of the twentieth century. ![]() Additionally, all photographic processes demand specific storage and exhibition considerations as well as training in the proper handling and care. Each photographic process possesses its own “unique deterioration characteristics” and each process's degradation is accelerated by slightly different factors (Northeast Document Conservation Center, 1999, p. Both of these formats consist of a light sensitive emulsion that is fixed to the glass plate base with a binder.ĭozens of photographic techniques have been used within the past 150 years. The term “glass plate negative” refers to two separate formats: the collodion wet plate negative and the gelatin dry plate. These glass supports are typically referred to as glass plate negatives. Prior to the invention of cellulose nitrate film in 1903, photographic emulsions were made on glass supports. Many individuals typically think of “photographs” as plastic-based negatives and slides but these photographic techniques are relatively recent inventions. Almost all archives possess some type of photographic collection.
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