Mona Lisa smiles again !
Known to be the most famous painting in the world -it has frequently raised questions. Now scientists have discovered another feature of Leonardo da Vinci's work. The Artist seemed to be in an experimental mood while painting this famous work of his. This time the oil paint he used to prepare the base layer was of a difference nature. Technically each of his paintings were different -said Victor Gonzalez the leading chemist at CNRS, France. They used X-rays to find out that the Artist used Plumbonacrite, a lead oxide byproduct, in to thicken the primary layer.