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NCJRS Abstract

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NCJ Number: 65110 Find in a Library
Title: LASER DETECTION OF LATENT FINGERPRINTS - PREPARATION OF FLUORESCENT DUSTING POWDERS AND THE FEASIBILITY OF A PORTABLE SYSTEM - TECHNICAL NOTE
Journal: JOURNAL OF FORENSIC SCIENCES  Volume:25  Issue:1  Dated:(JANUARY 1980)  Pages:150-153
Author(s): E R MENZEL; K E FOX
Corporate Author: American Soc for Testing and Materials
Promotions Manager
United States of America
Date Published: 1980
Page Count: 4
Sponsoring Agency: American Soc for Testing and Materials
West Conhohocken, PA 19428-2959
Format: Article
Language: English
Country: United States of America
Annotation: A SIMPLE PROCEDURE FOR THE PREPARATION OF FINGERPRINT DUSTING POWDERS FOR USE IN DETECTION BY LASER IS DESCRIBED, AND A TYPE OF PORTABLE LASER SYSTEM IS OUTLINED.
Abstract: IN PREPARING A DUSTING POWDER FOR USE IN DETECTION BY LASER, ABOUT 0.1 GRAMS OF A FLUORESCENT DYE IS DISSOLVED IN ROUGHLY 50 ML OF METHANOL. APPROXIMATELY 10G OF FMP 01 MAGNETIC DUSTING POWDER IS ADDED TO THIS SOLUTION. THE MIXTURE IS STIRRED UNTIL THE METHANOL HAS EVAPORATED. GENTLE HEATING OR BLOWING AIR OVER THE SOLUTION EXPEDITES EVAPORATION. THE PREPARATION PROCEDURE IS SIMILAR TO THAT REPORTED BY THORNTON FOR COUMARIN 6. THE FLOURESCENT DYE IS DEPOSITED INTO THE PARTICLES OF THE DUSTING POWDER. THE POWDER IS APPLIED BY MAGNETIC BRUSH, AND LASER EXAMINATION REVEALS LATENT PRINTS BY THE FLUORESCENCE OF THE DYE. A NUMBER OF DYES HAVE BEEN SUCCESSFULLY USED (FMP 01, RHODAMINE 6G, RHODAMINE B, NILE BLUE A PERCHLORATE, OXAZINE 1 PERCHLORATE, 3,3' -DIETHYLOXADICARBOCYANINE IODIDE, AND 3,3' -DIETHYLTHIATRICARBOCYANINE IODIDE). DYES PROVIDING NEAR-INFRARED FLUORESCENCE ARE OF LITTLE USE, SINCE THE DUSTED LATENT PRINTS CANNOT BE LOCATED BY VISUAL INSPECTION. A SPECTROSCOPIC DETECTION SYSTEM USED WITH A HELIUM-NEON LASER (WITH ABOUT 50 MW POWER) MAY BRING LASER DETECTION OF LATENT PRINTS INTO THE REALM OF PORTABILITY (THOUGH NOT WITH THE SENSITIVITY ALLOWED BY POWERFUL ARGON LASERS), PROVIDED AT 110 V (OR 220 V) ELECTRICAL POWER IS AVAILABLE AT THE CRIME SCENE. PHOTOGRAPHS AND REFERENCES ARE PROVIDED. (AUTHOR ABSTRACT MODIFIED--RCB)
Index Term(s): Crime laboratory equipment; Evidence identification; Latent fingerprints
To cite this abstract, use the following link:
http://www.ncjrs.gov/App/publications/abstract.aspx?ID=65110

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