SEARCH Articles Figures Tables A scanning electron micrograph, magnified 1000 times, illustrating the morphology of the particles in a pressure-sensitive scratch-and-sniff ad. Courtesy of Museum of Science, Boston. [Publishers Imprint] See Also: A scanning electron micrograph, magnified 1000 times, illustrating the morphology of the particles in a pressure-sensitive scratch-and-sniff ad. Courtesy of Museum of Science, Boston.