"Zhang speculated the greenery's hidden power lay within a yellowish material secreted by the ivy…It also has the ability to soak up and disperse light which is integral to sunscreens.
"'Nanoparticles exhibit unique physical and chemical properties due to large surface-to-volume ratio which allows them to absorb and scatter light,' Zhang said. 'Titanium dioxide and zinc oxide are currently used for sunscreen for the same reason, but the ivy nanoparticles are more uniform than the metal-based nanoparticles, and have unique material properties, which may help to enhance the absorption and scattering of light, and serve better as a sun-blocker.'" (EurekAlert! 2010)