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Smaller and mid-size blueprint machines were often outfitted with neutralizers which absorbed some of the ammonia for some time. If the lines are too light, it is also possible to run the blue line through the developing chamber once more, which often increases the contrast of the lines relative to the base media.
Blueprint typewriter ribbon; Carbonless copy paper; Photographic processes: Reflex copying process (also reflectography, reflexion copying) Breyertype, Playertype, Manul Process, Typon Process, Dexigraph, Linagraph; Daguerreotype; Salt print; Calotype (the first photo process to use a negative, from which multiple prints could be made) Cyanotype
In the "argot" of engineers, architects and designers, the resulting plan copies coming from any type of heliographic copier no matter they were either blue or white, were traditionally called blueprints, name derived from the blue background color of the cyanotype technique, which was the previous process for obtaining blueprints, When the ...
Traditional blueprints became obsolete when less expensive printing methods and digital displays became available. In the early 1940s, cyanotype blueprint began to be supplanted by diazo prints, also known as whiteprints. This technique produces blue lines on a white background. The drawings are also called blue-lines or bluelines.
OZALID was first federally registered in the United States as a trademark on February 5, 1929 as a brand for light-sensitive copying and photographic papers. The registration currently is owned by R.Q.O. Holding Company, Inc. of New York, and is related to the even earlier registration of October 11, 1923 in what is now the Federal Republic of Germany. [2]
Canon Production Printing, known as Océ until the end of 2019, [2] is a Netherlands-based subset of Canon that develops, manufactures and sells printing and copying hardware and related software. The product line includes office printing and copying machinery, production printers, and wide-format printers for both technical documentation and ...
A residual ammonia absorber containing citric acid powder, bromothymole blue indicator and water was invented by IBM to absorb the vented ammonia. [6] In 1964 they filed a patent for their diazo development process [7] and in 1965 they filed for their wash ammonia development device, [8] both granted in 1968.
The Diazo positive print was considered more readable than a negative blueprint, and the dry process eliminated the image distortion of wet paper. As with other earlier reprographic processes, a translucent original drawing was placed over a sheet of the sensitized paper and exposed to light. However, the next step exposed the paper to an ...
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