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Blue ink was not separated by paper chromatography but it was separated and differentiated by thin layer chromatography.Although both techniques are destructive in nature but Thin Layer Chromatography is best and reliable technique than paper chromatography.Identification of suspected documents has become common subject for forensic document examination. This study is aimed to determine the separation of ink within brands of blue ballpoint pen and results were compared with the acquired reference sample.Five brands of blue ballpoint pen which are widely used in India were taken (Two models from each brand). The blue ballpoint ink is separated in order to find out the composition of ink and its separation within their brands, model and batches and also to find out that which technique of chromatography is best and also to find out which solvent system is best to perform ink analysis.As a result, non-invasive methods of analysis are preferable for the forensic examination of documents.In this regard, spectral methods are the most effective ones; however, most of them have significant limits.

The time intervals for the implementation of each of these methods were determined using the ratios of the Raman peak intensities as degradation characteristics rather than their absolute values.

The invention relates a method for determining the time dating event of creation of an object made of a cellulose containing material and having on its surface areas with a coating and without coating, in which the results of measurements of the components of nuclear-magnetic resonance relaxation are used for determining the parameters of free induction signals and the density of protons in cellulose samples taken from the cellulose containing material surface layer with coated and uncoated areas, the value G of relative changes of the cellulose parameters are calculated using the formula: In this case the object is an article, its fragment, an area with a coating, a time dating event mark applied on the article.

The method of protection of an article from falsification of time dating event of its creation is proposed, in which a mark is plotted on the article surface.

All ingredients in the ink mixture can yield important analytical information to the forensic document examiner.

Therefore, it is better to use analytical techniques that can identify the variety of chemicals from which writing inks are composed [4].




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