by Police - Bureau of Police Research and Development

The Indian Police JournalSpectra 1: Superimposition of spectra’s of processed cyan colour takenfrom HP Business Inkjet 1000 Printer (spectra colour-black) &HP PhotoSmart C 3188 Printer (spectra colour-green)] at an Rfof 0.50.ConclusionChromatography of all four inks (CMYK) has been done for both ofthe printers. Besides visible colours, ink components revealed inBased upon the chromatogram developed and after scanning eachspots in densitometer, it was observed that all spots are not consistentwith each other. It is not always possible that output (printout) of twoInkjet printers is same.Spectra-1 indicates the some of the similar ink constituents in Cyancoloured ink. But some differences are also found, which might be ink manufacturer, which may not be having exactly the same inkconstituents as the original ink manufacturer.166 January - March, 2013