Physical Distinguishable of Heterogeneous Overlapping Resulting from Stamp-pad and Laser Printing Inks
Shraa, S., Abo Elmagd, A., Moustafa, Y., Bakr, A., Shabana, A., Abd El-Aziz, I. (2019). Physical Distinguishable of Heterogeneous Overlapping Resulting from Stamp-pad and Laser Printing Inks. EKB Journal Management System, 62(8), 1391-1412. doi: 10.21608/ejchem.2019.7319.1596
Samia Ibrahim Shraa; Abdel Aleem Solyman Abo Elmagd; Yasser Mohamed Moustafa; Al-Sayed Aly Bakr; Ahmad Shabana; Ibrahim Mohamed Abd El-Aziz. "Physical Distinguishable of Heterogeneous Overlapping Resulting from Stamp-pad and Laser Printing Inks". EKB Journal Management System, 62, 8, 2019, 1391-1412. doi: 10.21608/ejchem.2019.7319.1596
Shraa, S., Abo Elmagd, A., Moustafa, Y., Bakr, A., Shabana, A., Abd El-Aziz, I. (2019). 'Physical Distinguishable of Heterogeneous Overlapping Resulting from Stamp-pad and Laser Printing Inks', EKB Journal Management System, 62(8), pp. 1391-1412. doi: 10.21608/ejchem.2019.7319.1596
Shraa, S., Abo Elmagd, A., Moustafa, Y., Bakr, A., Shabana, A., Abd El-Aziz, I. Physical Distinguishable of Heterogeneous Overlapping Resulting from Stamp-pad and Laser Printing Inks. EKB Journal Management System, 2019; 62(8): 1391-1412. doi: 10.21608/ejchem.2019.7319.1596

Physical Distinguishable of Heterogeneous Overlapping Resulting from Stamp-pad and Laser Printing Inks

Egyptian Journal of Chemistry
Article 4, Volume 62, Issue 8, August 2019, Page 1391-1412  XML PDF (3.49 MB)
Document Type: Original Article
DOI: 10.21608/ejchem.2019.7319.1596
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Authors
Samia Ibrahim Shraa1; Abdel Aleem Solyman Abo Elmagd2; Yasser Mohamed Moustafa1; Al-Sayed Aly Bakr1; Ahmad Shabana2; Ibrahim Mohamed Abd El-Aziz email 3
1Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, Egypt
2Al-Azhar University, Chemistry Department, Nasr City, Cairo, Egypt
3Forgery & Counterfeiting Department, Forensic Medicine Authority, Cairo, Egypt
Abstract
Detecting the arrangement of intersecting stamp-pad ink and toner laser printing strokes is an excellent method of examining the documents originality. In this study, different six brands of stamp-pad inks, five laser printers of various brand and model, three types of paper surface, two kinds of seal materials and three methods of seal manufactures were utilized to produce the samples of heterogeneous intersecting strokes. A combination of the microscopic method as a digital microscope and analytical instrumental technique as Raman spectroscopy were performed to determine the arrangement of intersecting strokes. The digital microscope succeeds in detection the arrangement of intersecting strokes of some stamp-pad ink and fails in detection the others depending on their brands and colors through notation four physical properties at intersection point the specular reflection, the ink and toner gloss, gaps and spreading. The Raman spectroscopy determined the ink or toner stamped or printed later by comparison the spectra of pure ink, toner and their intersections and succeeds in detection all samples through the spectral data such as peak location and peak intensity. The combination of a digital microscope and Raman spectroscopy which applied here successfully discriminates the arrangement of intersecting strokes of toner and all brands of stamp-pad inks regardless of their brands and color.
Keywords
Forensic discrimination; Strokes intersection; Stamp-pad inks; Toner laser printer, Seal inks
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