He worked as a chemist in Nicolas Vauquelin's factory and, in 1918, became a preparator for Vauquelin's course at the Muséum national d'histoire naturelle. He began by studying dyes, then organic substances, while his colleagues were only interested in minerals. In 1823, he published his chemical research on animal fats. In 1824, he was appointed professor of chemistry and director of the Gobelins establishments, and took a particular interest in dyes. He was admitted to the Académie des Sciences in 1826.Autograph letter signed 07.05.1839: "... Avant de le donner à l'impression il [M. Pingar] pourrait le communiquer à Mr Philarète Chasles qui l’a fait demander à M. Chevreul”. 2 pp. in-8