Luminol, also known as luminescent amine, photogenic agent, or luminol, is a common luminescent chemical reagent that emits a striking blue light when mixed with appropriate oxidizers. It is a whitish to pale yellow powder, soluble in most organic polar solvents but insoluble in water. In forensic science, luminol is used to detect trace blood at crime scenes, while in biology, it is used as a substrate to detect the presence of copper, iron, and cyanide in cells.