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Effects of printing and ninhydrin treatment on forensic analysis of paper …
Effects of printing and ninhydrin treatment on forensic analysis of paper
studied the effect of printing & ninhydrin treatment on printed paper using conventional methods
result
grammage and thickness
grammage increased by double-sided color printing (similar with samples printed with same printer)
thickness increased slightly (erratically) by printing and ninhydrin treatment
ninhydrin treatment did not increase the grammage
XRD
XRD intensity and number of peaks remained the same after printing and ninhydrin treatment
microscopy
a slight color change caused by printing in some samples
pigment inkjet printer samples - some pulp fibers were partially colored (small and almost not stained)
laser-printed samples - no pulp stained
ninhydrin samples - no pulp stained
methods for paper analysis
measurement of grammage and thickness
changes in grammage
and thickness
detection of fillers by XRD
changes of XRD intensity by ink or toner on
paper
microscopic observation of pulp fibers by Graff ‘‘C’’ staining
printing and ninhydrin treatment caused changes in color
conclusion
grammage (in relation with printer type) and thickness (no relation with types of printer and paper)
printing showed few effects on XRD data for fillers and microscope observation of pulp
ninhydrin treatment affected only thickness