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193:. The paper is impregnated with a solution of ammonium ferric citrate and dried. When the paper is illuminated a photoreaction turns the trivalent (ferric) iron into divalent (ferrous) iron. The image is then developed using a solution of potassium ferricyanide forming insoluble ferroferricyanide (
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Introduction of the blueprint process eliminated the high expenses of photolithographic reproduction or of hand-tracing of original drawings. By the latter 1890s in
American architectural offices, a blueprint was one-tenth the cost of a hand-traced reproduction. The blueprint process is still used
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Different blueprint processes based on photosensitive ferric compounds have been used. The best known is probably a process using ammonium ferric citrate and potassium ferricyanide. In this procedure a distinctly blue compound is formed and the process is also known as
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discovered the procedure in 1842 and several other related printing processes were patented by the 1890s . When
Herschel developed the process, he considered it mainly as a means of reproducing notes and diagrams, as its use in
288:. The dark lines in the original are converted to a dark violet colour, while the white parts degrade to a light purplish colour. The back of the drawings is a cream colour in which the folds are degraded to a lighter colour.
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The diazo copies are of different sizes and for this reason the diazo paper is obtainable in standard sizes that vary from 30 cm to 60 cm wide, after de process the copied paper can be cut to the desired size.
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A blue-line print is not permanent and will fade if exposed to light for weeks or months, but a drawing print that lasts only a few months is sufficient for many purposes (test prints).
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is used for making: Hectographic prints, Ferrogallic prints, Gel-lithographs or Silver halide prints. All of them, until a certain size, can be achieved using a
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based compounds changed the background color to white, in technical environments, -by tradition-, the name for copies of technical drawings remained
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made from potassium ferricyanide and it must be washed with water to eliminate the excess ammonium ferric citrate and potassium ferricyanide.
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made from ammonia (or ammonia vapor) converting the parts of the paper not exposed to the light source to a characteristic dark blue colour.
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The light sensitivity of certain chemicals used in the cyanotype process, was already known when the
English scientist and astronomer Sir
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Economic
Committee: Sub-committee of Experts for the Unification of Customs Tariff Nomenclature. Draft Customs Nomenclature
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Dictionary of the
Printing and Allied Industries: In Inglés (with definitions), French, German, Dutch, Spanish andItalian
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lamp, similar to the manual action to expose both sheets strongly bonded directly to the sunlight, and once exposed:
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The paper used for the diazo copies is usually a bond paper or similar type, with a diazo coating sensitive to the
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or any other transparent or translucent material using different procedures. In general terms some type of
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201:) with the divalent iron. Excess ammonium ferric citrate and potassium ferricyanide are then washed away.
94:, although in English-speaking countries, it was intended, without much success, to change the name from
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In the "argot" of engineers, architects and designers, the resulting plan copies coming from any type of
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MarĂa de los Santos GarcĂa
Felguera; Marie-Loup Sougez; Helena PĂ©rez Gallardo; Carmelo Vega (2007).
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with an appropriate lamp (ultraviolet, etc...) but for big engineering and architectural plans, the
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A little smell of ammonia and a faintly purplish paper colour are the main characteristics of a
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Using the right compound some "cyano copiers" could be adapted to be used as "diazo copiers".
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From Craft to
Profession: The Practice of Architecture in Nineteenth-Century America
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for making contact prints on paper from original drawings made with that purpose on
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Cyanotype: the history, science and art of photographic printing in
Prussian blue.
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This is a simple process for the reproduction of any light transmitting document.
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Blueprint to
Cyanotypes - Exploring a Historical Alternative Photographic Process
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technologies, are of the roller type, which makes them completely different from
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technique, which was the previous process for obtaining blueprints, When the
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for special artistic and photographic effects, on paper and fabrics.
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because the process was simpler and involved fewer toxic chemicals.
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no matter they were either blue or white, were traditionally called
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427:"Exploring Photography – Photographic Processes – Cyanotype"
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New
Dimensions in Photo Processes: a step by step manual.
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a previously sensitized paper with a component called
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566:FJM Wijnekus; E.F.P.H. Wijnekus (22 October 2013).
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483:University of California Press, 1999
35:is an apparatus used in the world of
572:. Elsevier Science. pp. 844 –.
545:. Que Certification. pp. 244–.
323:, the copied paper is immersed in a
243:) for reproducing architectural and
539:Eva Zeisel; Robert Sabella (2006).
402:Blueprint Reading for MachineTrades
148:Architectural drawing, Canada, 1936
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542:Blueprints replaced by whiteprints
405:. Cengage Learning. pp. 3 –.
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613:Historia general de la fotografĂa
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458:. 2012-12-12. Archived from
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500:Gary Fabbri, Malin Fabbri
382:League of Nations (1937).
307:The original plan and the
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595:Blacklow, Laura. (2000)
399:David L. Taylor (2004).
223:Diazo copies of drawings
678:Technical drawing tools
33:heliographic duplicator
456:Vernacular Photography
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658:Ministerio de cultura
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253:The different names
245:engineering drawings
57:heliographic copiers
673:Non-impact printing
76:heliographic copier
49:heliographic copier
29:heliographic copier
606:Science Museum, UK
336:developer solution
325:developer solution
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623:978-84-376-2344-3
579:978-1-4832-8984-7
552:978-0-7897-3504-1
270:ultraviolet light
16:(Redirected from
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18:Diazo copier
616:. Cátedra.
233:Whiteprints
174:cyano-copie
37:reprography
667:Categories
527:, WS: PSLC
510:141169838X
489:0520214943
466:2012-12-22
437:2012-12-22
370:References
313:blacklight
286:whiteprint
260:whiteprint
241:blueprints
215:Whiteprint
209:See also:
170:Indian ink
158:architects
134:See also:
124:blueprints
103:Whiteprint
80:blueprints
354:Blueprint
303:Operation
239:process (
237:cyanotype
229:diazotype
211:Diazotype
191:cyanotype
154:Engineers
140:Blueprint
136:Cyanotype
97:Blueprint
92:Blueprint
84:cyanotype
65:diazotype
61:cyanotype
343:See also
280:Features
184:Features
63:and the
599:3rd ed.
431:V&A
330:In the
319:In the
299:light.
113:History
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512:page 7
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359:Ozalid
262:copier
168:using
274:diazo
88:diazo
618:ISBN
574:ISBN
547:ISBN
524:Blue
506:ISBN
485:ISBN
407:ISBN
213:and
156:and
138:and
264:or
100:to
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