Functionally invented photography as we know it. Niépce created the process of heliography, which he used to create View from the Window at Le Gras, the oldest surviving photograph of a real-world scene. Daguerre, another pioneer, partnered with Niépce and the two developed the physautotype method, which used lavender oil. After Niépce's death, Daguerre developed an even faster process, in which an iodized silver plate was exposed to light, treated with mercury fumes, and 'fixed' with a solution of sodium thiosulfate; that process, daguerreotypy, bears his name.