METHOD FOR FIXING LATENT FINGERPRINTS DEVELOPED WITH IODINE

• NCJ Number: 30851
• Journal: Journal of the Forensic Science Society Volume: 15 Issue: 3 Dated: (JULY 1975) Pages: 189-195
• Author(s): F TROWELL
• Date Published: 1975
• Length: 7 pages
• Corporate Author: Forensic Science Soc
• Publication Format: Article
• Language: English
• Country: United Kingdom

Annotation

A SOLUTION OF P,P'-TETRAMETHYLDIAMINODIPHENYLMETHANE (TETRABASE) IN 1,1,2 TRICHLOROTRIFLUORETHANE (FREON 113) IS USED TO REACT WITH THE IODINE TO PRODUCE A GREEN-BLUE COLOR, THUS FIXING THE LATENT PRINT.

Abstract

THE FREON 113 SOLVENT IS CHOSEN FOR ITS LOW TOXICITY, NON-FLAMMABILITY AND RAPID RATE OF EVAPORATION. WHERE THE USE OF THE SOLVENT IS TO BE AVOIDED, THE APPLICATION TO THE IODINE PRINT OF A PAD OF UNCURED SILICONE RUBBER PUTTY INTO WHICH DRY TETRABASE HAS BEEN INCORPORATED, CONVERTS THE PRINT TO A PERMANENT BLUE COLOR. (AUTHOR ABSTRACT)