Use of Scanning as a Complementary Method for Forensic Document Expertise

SALGADO, CRISTINA RENEÉ; DÍAZ, SILVIA; GALÍNDEZ, MARÍA CECILIA; VANDECAVEYE, SANDRA; FORLÍN, GISELA

MICROSCOPY & MICROANALYSIS

CAMBRIDGE UNIV PRESS

Año: 2020 vol. 26 p. 207 - 208

1431-9276

Scanning has many applications in the study of biological and material samples [1,2,3,4,5]. Public and private documents are liable to be altered by different methods. To detect fraudulent alterations several techniques are used, such as, visual, chemical and comparison techniques, as well as a series of different and complementary methods of expertise. The aim of this work was to determine differences between three types of printing on paper. The evaluated methods were printing with inkjet printer, toner and photocopy using optical and scanning electron microscopy techniques. The samples were observed with Leica DM500 and images were taken with Leica ICC50 W. Samples were mounted on aluminium sheets bonded with two-sided tape and then coated with gold using a sputter coater Denton Vacuum Desk II. Observations were made with a JEOL 5800LV SEM equipment. The following working conditions were employed: - high vacuum, -electrons acceleration voltage 15KV, -working distance 20 mm, - digital images were captured at different magnifications.