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This technique produces blue lines on a white background. The drawings are also called blue-lines or bluelines. [12] [13] Other comparable dye-based prints were known as blacklines. Diazo prints remained in use until they were replaced by xerographic print processes. Xerography is standard copy machine technology using toner on copy paper.
After exposure, the paper is developed by washing in cold running water: the water-soluble iron(III) salts are washed away. The parts that were exposed to ultraviolet turn blue as the non-water-soluble Prussian blue pigment remains in the paper. This is what gives the print its typical blue color. [22] The blue color darkens upon drying.
Cornelis Norbertus Gijsbrechts, Trompe l'oeil with letters and a roll of blue paper. Blue paper (known in Italian as carta azzurra, carta cerulea, and carta turchina) has often been used as a support for drawings and prints by artists. [1] With its inherent middle tone, blue paper is a particularly effective material for rendering the effects ...
Whiteprint plan copy. USSR whiteprints. 70s. Whiteprint describes a document reproduction produced by using the diazo chemical process. [1] It is also known as the blue-line process since the result is blue lines on a white background.
The paper will retain the image of the leaf after it has been rinsed with water. Once the paper dries, parts that were exposed to the sun will turn a shade of Prussian blue (ferric ferrocyanide), while parts that were covered by the leaf will remain white.
The different names blue-line copier, whiteprint copier or diazo copier, [9] were given, due to the nature of the process, which consists in exposing to an ultraviolet light a previously sensitized paper with a component called diazo, and finally developing it in a bath (a solution of ammonia in water) which converts the parts not exposed to ...
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