![]() After sufficient light exposure, the glass and original drawing are removed and the blueprint paper is washed to reveal a negative image. To make a blueprint, a heavy paper (or more rarely drafting linen) support is impregnated with potassium ferricyanide and ferric ammonium, placed under a translucent original drawing, weighted with glass, and exposed to ultraviolet light. Developed in the 1840s by John Herschel, blueprinting uses a wet process to produce an image of white lines on a cyan or Prussian blue ground. Between the late 19th century and the late 20th century, several processes emerged as the preferred methods, used for decades, while other less common processes were employed for shorter periods of time.Īlso called a cyanotype. For archivists, curators, librarians and other custodians of architectural records, traditional reprographic formats are now often seen as historic documents, with attendant needs for long-term care and conservation.īoth the underlying support-paper or plastic-and the image type are used to identify the specific processes used in architectural reprography. However, the integration of CAD-or Computer-Aided Design-over the last twenty-five years of design practice has made analog reprography far less common in the profession and more ephemeral in nature. These copies were typically used throughout the architect's own design process and also for distribution to clients, contractors, governmental agencies, and other interested parties. Beginning with major refinements in blueprinting processes in the 1840s, through the widespread adoption of diazotype printing after World War II, the design profession turned to analog architectural reprography to create accurate, to-scale reproductions of original drawings created on tracing paper, vellum, and linen supports. With the rise of the professionalized practice of western architecture in the second half of the 19th century, the field of architectural reprography-and the corresponding developments of photography and mass-produced wood-pulp paper-saw significant experiments and advances in technology. As well, architectural reprographic drawings are often in very large formats, making storage and handling decisions especially complex. Storage containers, handling, paper and chemical compositions and interactions, ultraviolet light exposure, humidity, mold, and other agents of potential harm all interact to determine the longevity of these documents. Within the context of archival preservation, the custodians of architectural records must consider many aspects of identification and care when managing the artifactual nature of these materials. JSTOR ( February 2009) ( Learn how and when to remove this template message)Ī US defense agent scanning in architectural documents.Īrchitectural reprography, the reprography of architectural drawings, covers a variety of technologies, media, and supports typically used to make multiple copies of original technical drawings and related records created by architects, landscape architects, engineers, surveyors, mapmakers and other professionals in building and engineering trades.Unsourced material may be challenged and removed.įind sources: "Architectural reprography" – news Please help improve this article by adding citations to reliable sources. ![]() C/CA 0.This article does not cite any sources. Remove)/Rect/Subj(Highlight)/Subtype/Highlight/T(omics)/Type/Annot> Blueprint )/Rect/Subj(Highlight)/Subtype/Highlight/T(omics)/Type/Annot>
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