Small Particle Reagent is used to develop latent print on wet or damp surfaces. It is not necessary to let the surface dry. SPR Spray is pre-mixed in non-aerosol bottles with pump sprayers. There is no mixing of solutions. 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 Spray are available, black and white. Use the black SPR on light-colored surfaces and the white SPR on the dark-colored surfaces.

A third type of SPR Spray is available for use with a UV lamp. Spray the UV solution on multicolored surfaces and view it under a long wavelength ultraviolet lamp. Photograph the resulting latent prints. It may be possible to lift the latent prints once dried, however, it is necessary to photograph them first.

Shelf life: 6 months from purchase. Keep in a cool, dark place.