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COPY RELIEF [1 record]

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Record 1 2005-01-21

English

Subject field(s)
  • Photoengraving
OBS

In the early days of halftone engraving the photo-engraver supplied the printer with an underlay formed by exposing a sheet of bichromated gelatin to light through a positive. On soaking, the printing areas of the a halftone, opaque on the positive, and not acted on by the lights swell into relief and create extra pressure at the printing areas.

French

Domaine(s)
  • Photogravure

Spanish

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