Writing with Sunlight: Recreating a Historic Experiment

• Simeen Sattar ^[1] ; Robert J. Olsen ^[2]
  1. [1] Bard College

     Bard College

     Town of Red Hook, Estados Unidos

     
  2. [2] Stockton University, United States
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 95, Nº 11, 2018, págs. 2006-2008
• Idioma: inglés
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• Resumen

  • This demonstration uses sunlight to write letters on a slurry of silver nitrate and calcium carbonate, recreating an experiment dating to the early 18th century. The letters appear as light silhouettes against a dark-gray background, with the gray due to elemental silver. The demonstration is a striking illustration of the photoreduction of silver ions, the fundamental process in conventional film-based photography. This demonstration kindles the interest of beginning students in oxidation–reduction reactions.