共查询到18条相似文献,搜索用时 256 毫秒
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制作了13枚"同版"渗透型印章和激光雕刻印章,分析了这些"同版"印章的印面特征和盖印印文特征.研究发现,相同条件下制作的"同版"印章的个体差异十分微小,如果考虑到各种盖印条件下,这些印章盖印印文特征的变化范围,"同版"印章印文的检验是十分困难的,甚至是不可能的. 相似文献
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文件上印章印文可变性印迹特征通常表现为印文上的异物印迹,文字线条的断线、露白,印文边框的缺损,浓重的印泥(油)点或团块,以及原子印章的套框、支撑爪的印迹等。根据印章的印面结构和印面附着物的变化规律,通过被检验印文与该印章印文的历时样本的比较检验,以印文的可变性印迹特征的异同,推断被检验印文的盖印时间。1利用印面结构不可逆变化特征鉴别印文盖印时间印面结构的不可逆变化的特征,主要表现为印面结构的缺损、磨损特征。这类特征从无到有,由少到多,发展到不同的变化程度,标志印章印面的不同变化阶段。它的异同一般可以界定盖印的… 相似文献
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先将真实印文用扫描仪扫描后输入计算机,经过图像处理后用彩色打印机打印,从而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方式.司法鉴定实践表明,这类伪造印文趋于专业化、技术化,且伪造的印文与真实印文相似度较高,依据传统的鉴定依据和方法难以鉴别真伪,甚至可能误导鉴定人员的判断.因此,本文指出,用色谱法对盖印印文和打印伪造印文的成分检测分析,从二者的溶剂和色料成分差异来判断其真实的形成方式,为科学的检验鉴定工作提供借鉴和依据. 相似文献
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通常情况下一份完整的文件有抬头、内容、落款签名或印文、落款时间等多个要素组成,文件是否真实有效,取决于与该文件有关的诸多要素。在许多案件的审理过程中,文件形成的确切时间往往是当事各方主要争议的焦点,特别是文件上印章印文的盖印时间更是最为常见的提请鉴定的问题。根据鉴定实践和实验研究,对印文墨迹分布特征及材料特性在印章印文盖印时间鉴定中的应用,及在鉴定过程中应当引起注意的相关事项进行探讨,并通过实际案例予以说明。 相似文献
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Biao Li M.Sc. 《Journal of forensic sciences》2014,59(5):1403-1409
Seals are often placed on important documents, and determining the date when a seal was affixed can be important to assess the authenticity of a document. In this study, thirty‐seven different brands of stamp‐pad inks and three different types of paper were used to make diachronic samples of the seals. The volatile components of stamp‐pad ink were determined, and the stamp‐pad ink was classified by gas chromatography with a flame ionization detector. Calibration curves were created to show the relationship between the content of volatile stamp‐pad ink components and the age of stamp‐pad ink entries stored under natural aging, UV‐induced aging, and heating aging conditions. The experimental results showed that GC was useful in the analysis of stamp‐pad ink and applicable for determining the relative age of stamp‐pad ink entries in some cases where the seal was placed on the document within 3 months. 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
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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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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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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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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