The inventor of lithography and stone printing. In 1796, Senefelder discovered that by using a greasy substance to write on polished Solnhofen limestone and then lightly etching it with an acidic gum Arabic solution, ink would only adhere to the areas which had been written on.
In 1818, Senefelder published his “Vollst Indiges Lehrbuch der Steindruckerei” (The Complete Textbook of Stone Printing), in which he outlined how the discovery came about.