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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.
A US defense agent scanning in architectural documents. Architectural 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 ...
Bond paper is a high-quality durable writing paper similar to bank paper but having a weight greater than 50 g/m 2. The most common weights are 60 g/m 2 (16 lb), 75 g/m 2 (20 lb) and 90 g/m 2 (24 lb). The name comes from its having originally been made for documents such as government bonds.
The resulting coating is then dried yielding the specially treated paper commercially sold as Diazo paper. This solution can also be applied to polyester film or to vellum. The process starts with original documents that have been created on a translucent medium. Such media include polyester films, vellums, linens, and translucent bond papers ...
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. The paper used for the diazo copies is usually a bond paper or similar type, with a diazo coating sensitive to the UV light.
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In 1919 the grandson of Lodewijk, Louis van der Grinten, became interested in the blueprint process used for producing wide-format technical drawings. At that time, blueprint paper was extremely light-sensitive, and had a very short shelf life. Louis invented a coating that made blueprint paper last up to a year.
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