Salt Prints
Invented by William Henry Fox Talbot in 1840 salt prints were the earliest positive prints.
Made by soaking a sheet of paper in a salt solution and then applying silver nitrate on one side. This produced light sensitive silver chloride in the paper. After drying, the paper was put directly beneath a negative, under a sheet of glass, and exposed to sunlight for anywhere up to two hours. Salt prints were made until about 1860 having been gradually replaced by the albumen print which gave a clearer image.
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