"Black Pearl Grain is a highly attractive bait containing micro-encapsulated Alphachloralose. Formulated to control mice infestations within 24-48 hours. The Alphachloralose active belongs to the narcotic family. Only a small amount needs to be consumed by a mouse and the active will start to take effect by reducing the body temperature of the mouse until it falls into a coma and dies. In a lot of cases this can take as little as a few minutes. There is very little danger of any secondary toxicity issues with Alphachloralose as residues in dead mice are negligible and wont effect any predators that might pray on a mice controlled by Black Pearl."