Markers with red luminescence under ultraviolet light were used as tracers for shadowing pursuits in a variety of criminal cases. The luminescent markers consisted of a mixture of 1% europium _-diketonates in Vaseline as the carrier. The visual detection limit under ultraviolet light was 1–100 ppm. Six types of europium _-diketonates were extracted with acetonitrile and promptly identified using both fluorescence spectrophotometry and electrospray ionization mass spectrometry at the detection limits of 10–100 ppb. Vaseline was readily analyzed by gas chromatography. The markers were scientifically identified for criminal proof in the field of forensic science. Three examples of the use of luminescent markers are described.
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