Pre-mixed in non-aerosol bottles with pump sprayers, this SPR solution is ready for use out of the box. Spray using straight, horizontal lines, back and forth above the suspected area so a “wash” of liquid flows over the surface. Two colors of SPR are available: black or white. Use Black SPR on light-colored surfaces and White SPR on darkcolored surfaces. Photograph the resulting latent prints. It may be possible to lift the latent prints once dried, however, you should photograph them first. Both colors have a fluorescent component that allows fingerprints to be detected using an ultraviolet or forensic light source. Pre-mixed SPR Spray has a shelf-life of six months from purchase and should be stored in a dark, cool place.
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