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Tirage au gélatino-bromure d’argent

The first monochrome emulsions using gelatin silver bromide were introduced in 1871 for the production of negatives on glass plates. The industrial manufacture of gelatin silver developing out papers was only finalized after the 1880s due to chemical improvements that allowed them to be made much more sensitive to light than aristotypes, the printing out emulsions of the previous era. Also more sensitive than the silver chlorides which, although developed, were used exclusively for contact prints, silver bromide allowed enlargement prints to be made without any blurring effect, therefore enabling the use of small-format negatives. This technological revolution, linked to the simplified process offered by the marketing of lightweight and easily transportable cameras for negatives, as well as the new availability of ready-to-use supports, would promote the development of an unprecedented market for amateurs and professionals alike.

So-called "baryta" papers, are made up of a layer of barium sulphate in between the support and the emulsion. Barium sulphate is a white pigment that increases shine and the whiteness of images when mixed with gelatine.

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