共查询到19条相似文献,搜索用时 703 毫秒
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目的 建立荧光法判断激光打印文件朱墨时序的检验方法,并分析不同型号的激光打印机制成的文件与不同材质的印章印文的采墨时序的特征.方法 利用VSCS000文检仪和Photoshop软件,采用荧光法对激光打印文件与印章印文交叉部位的特征进行检验,并对不同型号的打印机制成文字与不同材质的印章印文交叉部位的荧光特征进行分析比对.结果 发现常出现的共性特征为:制成文字先墨后朱,交叉部位的黑色墨迹颜色变淡并可见紫色荧光;先末后墨,交叉部位常常出现黑色墨迹缺损的现象,在缺损处可见紫色荧光点.但也表现出其特有的特征.结论 不同型号的打印机制成的文件与不同材质的印章朱墨时序所表现出来的特征不尽相同,在具体案件鉴定中应进行综合判断. 相似文献
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打印复印文件朱墨时序表观特征初探 总被引:1,自引:0,他引:1
本文详细介绍了一案例的检验过程,并通过简单实验对激光打印、静电复印形成文件的朱墨时序的表观特征进行了粗浅的探究。总体而言,两种时序在朱墨交叉点的表观特征上具有文字与印文均完整、肉眼感觉文字均压在印文之上的共同点;在两者本质的差异点上,先朱后墨表现为交叉点的墨粉与未交叉部位一致,先墨后朱表现为交叉点的墨粉光泽度增加、具有潮湿感、以及易出现水珠状的印油积聚现象。 相似文献
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无碳复写字迹与印文的朱墨时序检验 总被引:2,自引:0,他引:2
依据无碳复写纸的制造工艺、结构特点和复写原理,对无碳复写字迹与印文的形成时序特征进行探索,寻求判断两者形成次序的规律性特征以及检验依据和方法,以较为直观的显微检验,分析朱墨交叉点的微观形态,并提出利用微囊壳颜色分析、谷底显色及转印痕迹分析等方法对无碳复写字迹与印文的形成时序进行准确的认定。 相似文献
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运用高倍显微镜判断朱墨时序的方法 总被引:4,自引:1,他引:3
作者通过对手写文字与印章印文的朱墨时序的大量实验研究,并结合司法鉴定实践,总结了一套行之有效的运用高倍显微镜判断朱墨时序的检验方法,具有较大的应用价值。 相似文献
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印章印文与复写字迹先后顺序的检验 总被引:1,自引:1,他引:0
通常检验印文与笔迹的先后顺序,指的是圆珠笔、钢笔字迹与印章印文之间的检验。在实际办案中,笔者遇到复写字迹与印文的先后顺序辨别问题,如:在某市一起经济合同纠纷案中,当事人对合同复写签字、盖章生效问题有怀疑,需检验才能甄别是非。下面就此简述一下检验的方法: 相似文献
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目的考察在运用拉曼光谱阵列面扫描检验朱墨时序的方法中书写笔油墨种类对检验结果的影响。方法根据拉曼谱图的不同对搜集的188种书写笔(包括22种黑色圆珠笔,62种蓝色圆珠笔,62种黑色签字笔,42种蓝色签字笔)进行扫描并分类,采用拉曼光谱阵列面扫描技术对书写笔与同一印泥和印油形成的朱墨时序样本进行检验。结果 188种书写笔被分为4大类23小类,4类书写笔与印泥或印油形成的朱墨时序样本都得到了较好的检验结果。结论在本实验条件下,书写笔油墨种类对拉曼光谱阵列面扫描检验朱墨时序的检验结果没有影响。 相似文献
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光谱成像检验法在朱墨时序鉴定中的应用 总被引:4,自引:0,他引:4
光敏印文色料与签字笔书写色料交叉重叠后,因互溶渗透不易形成层状结构而使判定朱墨时序的难度较大。光谱成像检验法是通过比较交叉点、纯印文色料、纯墨迹色料处的反射曲线位置来判定交叉时序关系。 相似文献
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文件朱墨时序的检验方法及其比较分析 总被引:2,自引:0,他引:2
文件朱墨时序的判定是文件检验领域的难题之一。本文以38篇文献为基础,综述了目前常用的解决朱墨时序问题的十一种方法。并对各种方法的适用范围、优点和局限进行比较分析,以期为文检工作者视检材的具体情况采用合适的检验方法,提供一些参考。 相似文献
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几种朱墨交叉时序的检验方法及其比较分析 总被引:2,自引:0,他引:2
文件朱墨交叉时序的确定一直是困扰文检界的难题之一.本文简要介绍了目前常用的六种检验方法,并结合五个典型案例对各种检验方法进行比较分析,以探讨针对不同形成条件的文件物证进行检验时采用哪些检验方法更为有效的解决问题.希望能够在同类问题的研究上达到抛砖引玉的效果. 相似文献
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Signature examination is the most common examination performed by any document examiner. Determination of the authenticity of a handwritten signature on a questioned document is an important task for forensic document examiners in the forensic science field. As a result of continuous developments in technology, a signature stamp can now be created using a photosensitive seal to enable the reproduction of a handwritten signature. These stamps are commonly used in China and several other countries. In this study, 10 types of black photosensitive stamp-pad ink, 10 brands of fountain pen ink, 15 types of black gel ink and six types of black erasable gel ink found on the Chinese domestic market were collected and 10 photosensitive signature stamps were created using the signatures of 10 people. Microscopic analysis, infrared (IR) and fluorescence analyses and microspectrophotometry (MSP) techniques were used to examine the resulting photosensitive signature stamp impressions when applied to printing papers, writing papers and invoice papers. By comparing the printing and spectral characteristics of the photosensitive signature stamp impressions with those of the signatures executed using the fountain pens, gel pens and erasable gel pens, it was possible to determine whether each signature was written or stamped using a photosensitive signature stamp. To validate these results, a 96.7% absolute accuracy and a 99.3% detection rate were achieved over a total of 150 blind tests conducted by five forensic document examiners, thus demonstrating that a combination of the four analysis methods used in this work can provide a more scientific approach and improve the accuracy and the detection rate of the examination process.
KEY POINTS
- A signature stamp is a photosensitive seal made in the style of a handwritten signature.
- Although microscopic analysis can usually provide better examination results, a comprehensive examination method that includes microscopic analysis and ink composition analysis is required to improve the accuracy and the detection rate of the examination process.
- This study collected and tested photosensitive stamp-pad inks, fountain pen inks, gel inks and erasable inks.
- Infrared and fluorescence analyses and microspectrophotometry were able to distinguish the photosensitive ink from both erasable ink and fountain pen ink.
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Examining the sequence of intersecting seal and laser printing line is a significant method of determining the authenticity and validity of documents. In this study, five brands of stamp pad inks, three types of inkpads and seven kinds of laser printers were used to make heterogeneous line intersections. Observation method of physical characteristics, scraping technique and fluorescence method was used to determine the sequence of intersecting lines. Distinguishing features were noted between the materials produced in both sequences. As the results obtained from the study were positive, these features might provide a scientific basis for accurately determining the sequence between laser printing line and inkpad (stamp pad ink) seal. 相似文献
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介绍了丝网版印章的制作工艺,分析了丝网版印章印文特征的可变性和稳定性,总结了丝网版印章印文检验的方法,为司法鉴定实践中此类印章印文的真伪鉴别工作提供一定参考。 相似文献
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利用激光刻章机雕刻、光敏印章机制印伪造印章印文是近年来出现的一种新的、仿真程度较高的伪造印章印文的方法。鉴定实践表明,这类伪造印章印文趋于专业化、技术化,且伪造的印章印文与真实印章印文的相似度较高。依据传统的鉴定依据和方法难以鉴别真伪,因此从该类伪造方法对其特点和鉴定依据、方法要点进行研究,尤其是对伪造形成方式及特点的研究,有助于科学的鉴定其真伪。 相似文献
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The examination of stamp impressions has been an integral part of questioned document examination since its inception. Matching in design details and unique defects has proven to be essential factors for rubber stamps and stamp impression examination. In this study, several duplicate stamps were made from various rubber stamp manufacturers in Hong Kong, from the same original stamp impression(s). The objective was to examine the stamp impressions prepared from these duplicated stamp products and compared with each other and to determine whether they could be distinguished from the source stamp impression(s); by comparison of the size and defects deliberated introduced onto the latter. Further consideration of this study was an attempt to create a perfect duplicate stamp from an original stamp impression. The results of the analysis showed that the quality of source stamp impression(s) and scanner device of the stamp manufacturing process, and the knowledge of the stamp manufacturer were critical to the quality and outcome of the duplicated stamp products. It is concluded that although a perfect duplicate stamp could only be made under several essential control conditions, it was still possible to create a duplicate stamp that replicated the features of the original when a high-quality source stamp impression was available. 相似文献