Luminol Blood Reagent is generally used to assist in the visualization of blood stains and blood patterns or impressions. Luminol is very sensitive and commonly used to locate very faint blood traces when attempts have been made to clean suspected areas. Luminol is generally applied with a sweeping motion from a spray bottle or pump sprayer. EVIDENT provides Luminol in premeasured vials for ease of use in the field. One vial mixed with the corresponding quantity of water may be gently mixed in a spray bottle and applied to the suspected areas. Luminol is time sensitive and should be used immediately after mixing. After application, blood stains and patterns will glow a bright green and should be photographed immediately, as the effect will fade quickly. Each package contains six premeasured vials of powdered Luminol.