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ROTOGRAVURE PROCESS

Rotogravure process is an intaglio method of printing, meaning that the pictures, designs and words are engraved into the printing plate or printing cylinder. Acid is used to cut the images into the plate. Once the copy is photographed, positives are then made from the negatives. The images are transferred to the printing surface by use of carbon tissue covered with light-sensitive gelatin. The gelatin hardens based on the amount of light that passes through the positives. The plate or cylinder is then bathed in acid, which eats through the gelatin squares. On the printing press, the deepest cells retain the most ink and the darkest tones.

The earliest of card stock materials, including lobby cards, inserts and window cards, utilized this process until the 1920's. After this time, most of these materials were being printed using a new process known as photogelatin or collotype printing.

NOTICE: For paper stock, before the invention of the offset press, this was the only way that photographs could be put on posters. This process was normally used only for major productions. Quite often they would create an artwork style one sheet using stone or zinc lithography and a rotogravure style one sheet.

 

 

 

 



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