Luminol is a well-known and widely used method for the visualization of blood stains. This highly sensitive technique is commonly utilized to locate very dilute blood or areas where attempts have been made to wash away the blood and to visualize previously invisible bloody footwear impressions at crime scenes. In the past, Luminol has been problematic to use at crime scenes because of the tedious measuring and mixing required. We offer a premixed and premeasured formulation for Luminol that removes the hassle. Just take one vile of the Luminol reagent, add to water, shake gently, and spray the suspected areas with a pump sprayer or spray head.