graphicarts.princeton.edu
How light is scattered by the metallic nanoparticles on the surface of a daguerreotype determines the characteristics of its image, such as shade and color.
Andrea E. Schlather, Paul Gieri, Mike Robinson, Silvia A. Centeno, and Alejandro Manjavacas, “Nineteenth-century nanotechnology: The plasmonic properties of daguerreotypes” in PNAS (Proceedings of …