Objective To explore the effect of Calcium-Fluorescent-Sodium-Blue Bloodstain (CFSBB) on developing latent footprints contaminated with dust, urine and blood so as to define the suitable carrying objects and appropriate working requirements. Methods CFSBB, a new type of fluorescent agent, was respectively used to reveal the footprint samples that were stained with dust, human urine/blood on the commonly 4-class’s 8-type non-porous floor boards (No.1 to No.8). The latent footprints were photographed when developed by the pulverized CFSBB so that the extraction effect can be compared with those photos taken under natural light. Results With the exception of No. 4 carrying object, a kind of black marble, unable to make the latent footprint clearly appeared due to a low background contrast, the other 3-class’s 7-type floor boards have resulted in the latent footprints to be visualized with legible patterns in bright blue color no matter what the contaminants are dust, urine or blood. The CFSBB is obviously much better of extraction effect than the direct photographing against the footprint samples on carrying objects under natural light. Conclusion CFSBB is suitable to develop the latent footprints contaminated with dust, urine and blood on light-colored non-porous carrying objects.
Key words
CFSBB /
dust footprint /
urine footprint /
bloody footprint /
effect of development
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