NCJ Number
11997
Journal
Journal of Forensic Sciences Volume: 18 Issue: 4 Dated: (OCTOBER 1973) Pages: 418-433
Date Published
1973
Length
16 pages
Annotation
EVALUATION OF THE APPLICATION OF VARIOUS INFRARED TECHNIQUES TO THE NON-DESTRUCTIVE PHYSICAL EXAMINATION OF 71 SAMPLES OF DIFFERENT INKS AVAILABLE IN INDIA.
Abstract
THE SPECIFIC INFRARED TECHNIQUES INVESTIGATED INCLUDED THERMOFAX EXAMINATION, DICHROIC FILTERS, INFRARED REFLECTION PHOTOGRAPHY, INFRARED LUMINESCENCE, AND VISUAL OBSERVATIONS WITH AN INFRARED IMAGE CONVERTER. DETECTION AND DECIPHERMENT OF ERASED, ALTERED, AND OBLITERATED INK WRITINGS AND TYPEWRITINGS WERE ATTEMPTED WITH VARYING DEGREES OF SUCCESS USING THESE METHODS. IT WAS FOUND THAT NONDESTRUCTIVE INFRARED TECHNIQUES COULD BE EMPLOYED WITH ADVANTAGE FOR SOLVING SPECIFIC PROBLEMS OF DOCUMENT EXAMINATION. THIS APPROACH WAS ESPECIALLY USEFUL WHEN EMPLOYED WITH OTHER ESTABLISHED TECHNIQUES OF ULTRAVIOLET LIGHT EXAMINATION, MACRO-PHOTOGRAPHY, AND PHOTOGRAPHY USING COLORED FILTERS. (AUTHOR ABSTRACT MODIFIED)