FAH291H5 Chapter Notes - Chapter 1-18: Lavender Oil, Louis Daguerre, Silver Chloride
16 Sep 2016
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Found that chalk and nitric acid into which silver was dissolved was darkened by sunlight not by exposure from heat or fire. Wanted to preserve camera obscura on something permanent. Developed the first system for making images permanent through the action of light. Discovered that bitumen of judea, a lithographer"s material made from asphalt, was sensitive to light in 1822. Discovered that it loses its solubility in lavender oil. Took paper engraving and placed it in contact with the lithography stone and exposed it in the sun for 2 hours. Now known as fixer and solvent, to expose image. Great success in stimulating experience on stage. Discovered that vapor from mercury does the trick to shorten exposure time. His friend (francois arago) presented his discovery to the academie des sciences in paris and got the government to patent his work. Coated sheets of ordinary writing paper with sodium chloride and when they dried, recoated with silver nitrate, forming silver chloride.
