...Now, through the use of advanced X-ray technology, scientists have made a groundbreaking discovery that sheds light on Leonardo da Vinci's remarkable techniques.In a study recently [2023] published in the Journal of the American Chemical Society, researchers revealed that a rare compound, known as plumbonacrite, was found in the first layer of paint on the Mona Lisa. This compound, a byproduct of lead oxide, provided crucial evidence that Leonardo likely used lead oxide powder to thicken and hasten the drying of his paints.Lead researcher Victor Gonzalez explained how this compound, which has an orange color when mixed, was used in...