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date: 20 August 2022

photogravure 

Source:
The Oxford Companion to the Book

An *intaglio process of making high-quality prints of continuous-tone images from a *plate coated with light-sensitive, acid-resistant gelatine, exposed through a photographic image using a screen. The gelatine hardens in proportion to the amount of light transmitted through lighter and darker areas of the image. Hot water washes away the gelatine in relation to the exposure, forming a resist (or coating) on the plate in the areas that will print lighter and exposing the areas that will print darker. Immersed in acid, the plate is bitten in proportion to the thickness of the resist. The variable depth of etch registers an extraordinary range of tones. Deeper recesses will accept more ink, therefore printing darker. The process emerged in the ... ...

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