Name Amon First

Negative paper

Exposure produces a latent image, barely visible to the naked eye, which is revealed by development in a solution of gallo-nitrate of silver. The developed image is then stabilized in a potassium bromide bath--although this was gradually replaced in the second half of the 1840s with sodium thiosulfate, called hyposulfite of soda at the time. The resulting negative is usually coated with wax for more transparency. Until the 1850s, salted paper prints were made by contact with paper negatives in a printing-frame.

The paper negative processes were used in the 1840s and 1850s, first in England where it was invented, and then in France starting in the late 1840s. Commercial development of the calotype was hindered by its inventor's many patents, as well as the visual characteristics of the resulting image–brown or sepia tones, high contrast, and slightly blurry results.

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