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| Two fingerprints on a car, developed with SPR. Larger image in a pop-up window |
| Two fingerprints on a blue car, developed with white SPR (first sprayed with white SPR and then rinsed with water). Larger image in a pop-up window |
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Small Particle Reagent (SPR) is a suspension of molybdenedisulfide powder in water with a detergent. The powder particles adhere to a fingerprint as does a fingerprint powder. The gray, shiny prints that are developed with SPR can be lifted (after drying) with gelatin lifters, instant lifters or tape.
Powder suspension can be sprayed, but small articles can also be submerged in it (after diluting the ready-to-use B-86000). The SPR method has the advantage that it can be used on wet and/or dirty/greasy surfaces.
Cat. No. B-86000
Small Particle Reagent (SPR), 500 ml ready-to-use, in a spray
bottle
White SPR is a suspension of white powder in water with a detergent. It works similar as the "gray" SPR (see above) but provides better contrast on dark surfaces.
Background staining is more pronounced with white SPR. Rinsing with water after application of white SPR is therefore advised.
Cat. No. B-86600
White SPR, 500 ml ready-to-use, in a spray bottle
The flame technique uses the heavily sooting flame that is produced by burning camphor. An object (for example a bank note or a hammer handle) is held in the smoke of the burning camphor. After the surface is covered with a sufficient amount of soot, the excess is brushed off with a marabou brush.
Cat. No. B-80000
Camphor, 50 g in a plastic bottle (100 ml)
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