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Next, the original is peeled from the diazo paper as the sandwich of master and diazo exits the machine, and the diazo sheet alone is fed into the developing chamber. Here, fumes of ammonium hydroxide create an extremely alkaline environment. Under these conditions, the azodyes (couplers) react with the remaining diazonium salt and undergo a ...
Speedball is a US manufacturing company of stationery and art products, based in Statesville, North Carolina. The company was originally established as the "C. Howard Hunt Pen Company" in 1899, [ 4 ] to manufacture dip pens .
Produced diazo copies. Could produce up to 99 copies in a single pass, the quantity controlled by a dial, or from punches on the master card; IBM 9965: Diazo Copier [13] [10] IBM claimed this was: The only diazo film copier in its price range that in one step copied images from roll microfilm to punched cards as well as from card to card. [5]
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.
In organic chemistry, the diazo group is an organic moiety consisting of two linked nitrogen atoms at the terminal position. Overall charge-neutral organic compounds containing the diazo group bound to a carbon atom are called diazo compounds or diazoalkanes [ a ] and are described by the general structural formula R 2 C=N + =N − .
The Ozalid process is a process of printing positive images on paper from patterns on film or other translucent media. Its objective is the creation of a photogram, using chemically treated paper. A transparent film with the pattern to be printed is placed on a diazo compound coated paper. This sandwich is exposed to ultraviolet light.