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Decipherment of disappearing ink on different documents by chemical and instrumental techniques

Author Affiliations

  • 1Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj (Allahabad), UP, India
  • 2Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj (Allahabad), UP, India

Res. J. Forensic Sci., Volume 11, Issue (1), Pages 1-5, January,29 (2023)


Nowadays, criminals are adopting new modus operandi with the new technology to cheat the individuals. One of the latest techniques applied to commit frauds with bank instruments (cheque or other withdrawal form) or any other paper documents is the use of disappearing ink pen. Disappearing ink is a solution, which when applied on paper, cloth or any material will disappears slowly when comes in contact carbon dioxide present in the air within few minutes to few hours without leaving any visible traces. These inks are not normally visible under visible light, ultra-violet rays or infrared rays. Thymolphthalein and phenolphthalein was used to make the blue and red disappearing ink respectively. The prepared ink was examined on different types of papers to identify its fading time. These inks was decipher when treated chemically with the alkaline solution of NaOH and KOH, and by iodine fuming method. An instrumental examination was carried out to visualize the faded writing by Video Spectral Comparator (VSC), Docucenter NIRVIS, Projectina Docubox and Forensic XP-4010 D. The aim of this study is to develop a simple and rapid technique to solve the financial crimes related to cheque, bills, deeds, contract, etc. committed through these inks.


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