NCJ Number
184287
Journal
Journal of Forensic Identification Volume: 50 Issue: 4 Dated: July-August 2000 Pages: 357-362
Date Published
2000
Length
6 pages
Annotation
This article describes a procedure for detecting latent fingerprints on the adhesive side of dark tape.
Abstract
Liqui-Drox, a solution composed of Ardrox, Liqui-Nox, and water, is a fluorescent dye that can be used to detect fingerprints on the adhesive side of tape. The Ardrox in the solution readily penetrates the indentations created by the ridges of the finger coming in contact with the adhesive surface. The dye solution is easily rinsed away from the surrounding surface, yet adheres to the indentations. Ardrox is highly fluorescent with long-wave ultra-violet excitation, causing this fluorescent technique to be ideal for dark-colored adhesive surfaces. Once the Liqui-Drox is applied to the surface and any latent prints become visible, they should be photographed as soon as possible. The fingerprints developed by this technique begin to fade or blend with the background within about 12 hours. It is impossible to see any ridge detail once 48 hours have elapsed. The ridge detail of the fingerprints cannot be regenerated by additional application of Liqui-Drox. The use of a 515 nm filter allows for some of the background fluorescence to be eliminated during photography. Liqui-Drox is only effective on tapes that have not been damaged by environmental conditions or excessive heat. 2 figures and 3 references