👉 Atropaceous refers to a substance that is characterized by having low density, high viscosity, and a tendency to precipitate under certain conditions. This property of atropacy allows it to be used in a variety of applications due to its ability to form droplets or crystals when heated or subjected to other forces. Atropacetylation occurs when the substance undergoes a phase change from solid to liquid without undergoing any chemical reactions, as described by the French chemist Jean-Baptiste Lamarck