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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.
The blueprint process is based on a photosensitive ferric compound. The best known is a process using ammonium ferric citrate and potassium ferricyanide. [6] [7] 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.
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 ...
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
1919: Louis van der Grinten conducted research into blueprint materials and entered the copier market. The breakthrough was the development of a paper superior to the former light-sensitive coated blueprint paper that had short shelf lives. [5] 1927: Louis van der Grinten invents an ammonia-free, diazo-copying
Ammonia is an essential ingredient in many biological processes, including as a building block to form amino acids, which in turn can link together into long chains to make proteins.
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.
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