NCJ Number
128910
Journal
Journal of Forensic Sciences Volume: 36 Issue: 2 Dated: (March 1991) Pages: 466-469
Date Published
1991
Length
4 pages
Annotation
The presence of nonvisible written material was detected on documents during an examination for infrared luminescence. An experiment was conducted to examine absorption by paper of noncolor ink components from documents bearing written material.
Abstract
Various inks were used to prepare sample writings. Each sample writing was prepared on an original sheet of paper with a corresponding undersheet. These sheets were then placed between upper and lower protective sheets. Each 4-sheet sample was left intact for a 72-hour period. The presence of nonvisible writing resulting from the absorption by paper of noncolor ink components was detected on particular sample sheets when examined for ultraviolet fluorescence and infrared luminescence. The methods used and the results are discussed. 7 figures and 5 references (Author abstract)