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Luminol. Lightning® Luminol is a water-based spray reagent used for the detection of trace amounts of blood. Identify an area where blood stains are suspected, turn out the lights and spray the area with the included fine mist sprayer. A positive presumptive identification for the presence of blood will be viewed as a white/blue glow. The resulting pattern can be photographed. No light source is required for viewing. Will produce 16 ounces.