Scientists identify secret ingredient in Leonardo da Vinci paintings

"Old Masters" such as Leonardo da Vinci, Sandro Botticelli and Rembrandt may have used proteins, especially egg yolk, in their oil paintings, according to a new study. #press

https://www.cnn.com/style/article/old-masters-da-vinci-egg-yolk-painting-scn/index.html?utm_source=press.coop