Name Amon First

Dessin photogénique

It was then stabilized in an alkaline halide solution (chloride, bromide, or iodide) before the remaining sensitized salts were washed off the paper with water. The lilac, brown, and yellow shades generated by sodium chloride, potassium bromide, and potassium iodide respectively tend to darken over time, making the image relatively unstable when stored in darkness and even more fragile when exposed to light.
More stable photogenic drawings were obtained after the introduction of sodium thiosulfate (known originally as hyposulfite of soda) to 'fix' the images. This did not occur until around 1840, however, when the process became obsolete and was gradually replaced by the calotype, a faster and much more effective way to capture images.

At the time, photogenic drawings were printed by contact on salted papers in a printing-frame. The image of a photogenic drawing, which may be matte or semi-matte depending on the paper used, is formed in the fibers of the paper itself. Sometimes, the paper is coated with a translucent oil- or wax-based product to improve the print resolution.

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