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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The process starts with original documents (those that needed to be reproduced) that have been created on a translucent medium. Such media included polyester films (1980s), vellums (1970s 1980s), linens (1930s 1970s), and translucent bond papers (bonds). Any media that allowed some quantity of light to pass through typically worked well as a master, and the duration of time for which the master would ultimately be required to be maintained largely determined the parti...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The process starts with original documents (those that needed to be reproduced) that have been created on a translucent medium. Such media included polyester films (1980s), vellums (1970s 1980s), linens (1930s 1970s), and translucent bond papers (bonds). Any media that allowed some quantity of light to pass through typically worked well as a master, and the duration of time for which the master would ultimately be required to be maintained largely determined the particular choice of media material. Depending on the thickness of the master and the media type, the intensity of the UV exposure light (see below) was adjusted through an intensity knob that had typically been pre-marked for all the typical media types that were used for masters in any particular shop. Similarly, the speed control (for setting the speed at which the sheets would be pulled through the machine) were likewise typically pre-marked in any particular shop, having been optimized based on trial runs.