Salted Paper Print
Among the earliest photographs, salted paper prints were created by the action of sunlight on paper coated with light-sensitive silver salts and placed in contact with a negative. American photographers started to make salted paper prints in the 1850s when glass plate negatives came into use. After exposure, the prints were fixed, washed, and dried. Prints were usually toned with a gold-containing solution, resulting in an image that ranged in hue from reddish-brown to purplish-black. The silver image resides within the paper's surface fibers and has a distinct matte appearance. Salted paper prints were made through the 1860s.