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Many techniques have been developed to determine the sequence of strokes depending on the nature of writing instrument, type of ink or type of material. Determining the sequence of stroke is still very challengeable job for forensic document experts. With the popularity in different types of writing instruments and ink, the determination of sequence of stroke can be problematic. The application of allied sciences and analytical techniques of forensic science to questions concerning documents is termed forensic document examination. Determining sequence of strokes is an integral part of forensic document examination. The need for the investigation of sequence of strokes of writing emerges when it is alleged that a statement is written after the signature was done on the document or this examination can be performed to learn which of the handwriting was last written. The examination of sequence determination is very important job to fix the accountability of the person who had forged the document by making additions after the accomplishment of the document. By examining properties of ink like absorption of ink onto the paper, color of the ink, properties of ink like gloss and luminescence can help in more easier and faster detection of sequence of intersecting lines [1-6]. It is possible to observe how the pen tip, besides releasing the ink, deforms the paper. This is because; the writing pressure leaves more or less deep impressions, according to: Writing pressure (amount of pressure exerted over the paper during act of writing) ;Underlying material (sheet of paper lying on metal surface or on paper block); Writing material (fountain pen, pencil, gel pen, ballpoint pen interact in different ways with paper); Type of paper used (the production process determines the size and the morphology of the fiber’s layers in the paper) (Max Frei theory revisitation: does really strokes depth changes along time ). (Based on microscopic analysis) claimed that strokes are time dependent, due to the (supposed by his observations) 3-years paper elastic release time. According to his theory it is possible to try to date the handwritten document studying depth change over time. Montani, et al. [7], Examination of Heterogeneous Crossing Sequences between Toner and Roller ball Pen Strokes by Digital Microscopy and 3-D Laser Profilometery [7] . Giuseppe Schirripa Spagnolo [4] Potentiality of 3D laser profilometery to determine the sequence of homogenous crossing lines on questioned documents. In this paper the potentiality of the 3D micro-topography to resolve the writing order of signatures to detect the tampering of manuscripts, to analyze pressure variation, and to identify strokes in handwritten [4]. A study to visualize and determine the sequencing of intersecting ink lines examined sequence of Abstract

Determining Sequence of Strokes of Green Pen Ink and Blue Seal