Also called a Salt Print, is a method in which required a prolonged exposure time in a camera so that a photogenic negative is produced. Which then after a negative has been created it can be used to create positive photogenic prints. A sheet of writing paper is washed with salt and dried; the other side is then sanitized with silver nitrate on one side. The sanitized side is then placed with direct contact to the negative glass printing frame. Then exposed, glass side up to sunlight up until the desired density of the print.
This was invented by William Henry Fox Talbot.
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