11.9.2012 @ Smithsonian
Pollia condensata, native to Africa, uses nanoscale-sized structures to produce the most intense color ever studied in biological tissue. A wild plant that grows in the forests of Ethiopia, Mozambique, Tanzania and other African countries, can’t be eaten raw, cooked or turned into a beverage. In Western Uganda and elsewhere, though, the plant’s small metallic fruits have long been used for decorative purposes because of an unusual property: They stay a vibrant blue color for years or even decades after they’ve been picked. A specimen at the Kew Botanical Gardens in London that was gathered in Ghana in 1974 still retains its iridescent hue.