Before revision: Carl August von Steinheil and Franz von Kobell's silver chloride photograph of Frauenkirche from the Old Academy, March URL The first permanent photoetching was an image produced in 1822 by the French inventor Nicéphore Niépce, but it was destroyed in a later attempt to make prints from it.
After revision: Carl August von Steinheil and Franz von Kobell's silver chloride photograph of Frauenkirche from the Old Academy, March 1837 The first permanent photoetching was an image produced in 1822 by the French inventor Nicéphore Niépce, but it was destroyed in a later attempt to make prints from it.