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2. Heliographic copier - Wikipedia

   en.wikipedia.org/wiki/Heliographic_copier

   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 ...

3. List of duplicating processes - Wikipedia

   en.wikipedia.org/wiki/List_of_duplicating_processes

   Manifold stylographic writer, using early "carbonic paper" Letter copying book process; Mechanical processes Tracing to make accurate hand-drawn copies; Pantograph, manual device for making drawn copies without tracing, can also enlarge or reduce; Printmaking, which includes engraving and etching. Relief printing including woodcut

4. Letter (paper size) - Wikipedia

   en.wikipedia.org/wiki/Letter_(paper_size)

   The precise origins of the dimensions of US letter-size paper (8.5 × 11 in) are not known. The American Forest & Paper Association says that the standard US dimensions have their origin in the days of manual papermaking, the 11-inch length of the standard paper being about a quarter of "the average maximum stretch of an experienced vatman's arms". [2]

5. Whiteprint - Wikipedia

   en.wikipedia.org/wiki/Whiteprint

   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. It is a contact printing process that accurately reproduces the original in size, but cannot reproduce ...

6. Printing and writing paper - Wikipedia

   en.wikipedia.org/wiki/Printing_and_writing_paper

   [citation needed] A4 ("metric") paper is easier to obtain in the US than US letter can be had elsewhere. [citation needed]. The ISO 216:2007 is the current international standard for paper sizes, including writing papers and some types of printing papers. This standard describes the paper sizes under what the ISO calls the A, B, and C series ...

7. Blue paper - Wikipedia

   en.wikipedia.org/wiki/Blue_paper

   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 ...