Journal Published Online: 01 November 1989
Volume 34, Issue 6

Photographically Subtracting Interfering Images from ESDA Print

CODEN: JFSCAS

Abstract

Documents containing indentations from other written papers may also contain original written material on the reverse side of the page. When such a document is processed on an Electrostatic Detection Apparatus (ESDA), both the subject indentations and the writing on the reverse of the paper are often recorded. It is usually very difficult to decipher the indented writing because of the overlapping images from the reverse of the paper. It is possible, however, to subtract these interfering images by making a positive transparency of the original writing on the reverse of the paper and sandwiching it with a negative of the ESDA. This method provides a clear and accurate record of the subject indentations alone.

Author Information

Hart, LJ
Hart Questioned Document Laboratory, Inc., Miami, FL
Hart, RP
Florida Forensic Photography, Miami, FL
Pages: 3
Price: $25.00
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Stock #: JFS12782J
ISSN: 0022-1198
DOI: 10.1520/JFS12782J