After exposure to sunlight for a long time, the parts that were exposed to light became hard and the parts that were not could be washed off with lavender oil. 1837: DaguerreotypeThe daguerreotype process (named after Louis Jacques Mande Daguerre) produces a unique image, as there is no negative created. After coating a copper plate with light-sensitive silver iodide, the plate is exposed to an image for over 20 minutes and then treated with fumes from heated mercury. The longer the exposure to light, the more mercury fumes are adsorbed by the silver iodide. After the plate is washed with salt water, the image appears, reversed. This was the earliest photographic process to gain popularity in America. It was used until around 1860. 1839: Salt printThis was the dominant form of paper print until Albumen prints were introduced in 1850. Salt prints were made using both paper and glass negatives. 1841: CalotypeWilliam Henry Fox Talbot invented the negative-positive system of photography commonly used today. He first developed the Talbotype, which used silver chloride to sensitize paper. After improving the process by using silver iodide, he renamed it Calotype. The process could produce many positive images, but they were not as sharp because they were printed on fibrous paper rather than glass. 1842: Cyanotype (Ferro-plusiate, Blue process)This process forms blue-colored images through a reaction to iron salts. John Herschel studied it in order to reproduce his complicated math formulas and memos. Other processes that fall into this category include Kallitype, Vandyketype, and Platinum printing. 1850: Albumen printThis process, introduced by Louis Désiré Blanquart-Evrard, was the most common kind of print in the latter half of the nineteenth century. Beautiful sepia gradation images were created by using albumen and silver chloride. The surfaces of prints made with this process were glossy because of the egg whites which were layered heavily to prevent the originally thin prints from curling, cracking, or tearing easily. This type of print was especially common for studio portraits and landscape or stereoviews. 1851: Wet collodion process and AmbrotypeFrederick Scott Archer developed the wet collodion processes, which used a thick glass plate unevenly hand-coated with a collodion-based, light-sensitive emulsion. Collodion, which means ‘glue’ in Greek, is nitrocellulose dissolved in ether and ethanol. The Ambrotype, an adaptation of the wet collodion process, was developed by Archer and Peter W. Fry. It involved placing a dark background behind the glass so