1727 Johann Heinrich Schulze (1687-1744)) Johann Heinrich Schulze, a professor of anatomy, After a number of experiments discovered that silver salts, specifically a piece of chalk dipped in silver nitrate turned black from white when exposed to the sun. The unexposed side remained white. He experimented creating crude photographic impressions, but eventually it all turned black due to exposure. Previous Start Next Quick Jump in Time Return 300 BC Aristotle 1000 Ali Al-Hazen 1490 DaVinci 1558 Della Porta 1614 Angelo Sala 1661 Robert Boyle 1727 Johann Schulze 1800 Combined Process 1806 Thomas Wedgwood 1827 First Picture 1829 Niépce & Daguerre 1832 Charles Wheatstone 1835 First Negative 1839 Henry Talbot 1839 Daguerreotype 1839 John Herschel 1839 Giroux Camera 1840 Alexander Wolcott 1842 Edward Anthony 1843 Joseph Puchberger 1844 Henry Fox Talbot 1845 Mathew B. Brady 1851 Frederick Scott Archer 1853 Adolphe Martin 1853 John Jacob Bausch 1858 Gasper Felix Tournachon 1861 Oliver Wendell Holmes 1861 Adolphe Bertsch 1861 Mathew Brady 1866 Walter E. Woodbury 1871 Dr. Richard Maddox 1880 George Eastman 1883 Bausch & Lomb 1884 Eastman Film 1888 George Eastman 1893 Edison & Dickson 1894 Lumière 1904 John A. Dick