by Police - Bureau of Police Research and Development

The Indian Police Journal Over the past decades, there has been a tremendous increase in theof printers are available in the market. Out of which Inkjet printers aresimple, having high ppm (page per minute) capacity, accessible andare of low cost. This made printing from Inkjet printer very convenientnot only for legitimate use, but also for illegal activities. Criminalstendency poses a serious threat to any nation's economy.Inkjet printing became widely accepted about 20 years ago with theintroduction of the IBM 46/40 printer in 1976 and of the Siemens types of Inkjet printer inks offering improvements. These inks containvarious functional categories of ingredients. Inkjet printer ingredientsinclude colourants (dyes, pigments), solvents, resins, humectants agents (as some dyes require pH control for longer term storage). Inkexamination can be regarded as a specialized area of Forensic (orquestioned) document examination, which itself covers dozens ofgeneral categories of analyses. In an investigation scenario, Forensicexperts are required to examine and analyze the printer inks.out any difference or similarity between processed inks of each printerby separating its ink components. Several solvent systems have been1,2 dichloroethane: Acetone, 1,2 dichloroethane: Ethanol: Ethyl which n-butanol: acetone: distilled water: ammonia has been foundto give better results.Materials & Methods• Reagents and Apparatus ‣ Ammonia & 1,2 dichloroethane of AR Grade. ‣ Precoated Silica Gel 60 TLC plates from Merck (with162 January - March, 2013