Ancient recipes led scientists to a long-lost natural blue
Scientists have resurrected a purple-blue hue whose botanical origin had been lost to time. The pigment, called folium, graced the pages of medieval manuscripts. But it fell out of use, and the watercolor’s identity has eluded scientists for decades. Now, after tracking down folium’s source, researchers have mapped out the chemical structure for its blue-producing molecule. Such chemical information can be key to art conservation. “We want to mimic these ancient colors to know how to … preserve them,” says Maria Melo, a conservation scientist at Universidade Nova de Lisboa in Caparica, Portugal. But to unmask folium’s identity, Melo and her team first had to find where it came from. The researchers turned to medieval texts that described the source plant. With the help of a botanist, they discovered Chrozophora tinctoria, a tiny herb with silvery-green foliage. In a village in the south of Portugal, the team found the wild plant growing along the roadside and in fields after harvest. Back in the lab, researchers...