采用HPLC区分环保水性印油印迹种类

目的建立环保水性印油印迹的高效液相色谱（HPLC）的区分方法。方法采用超声提取与离心,以ZORBAX Eclipse Plus Phenyl-Hexyl（4.6mm×50mm,1.8μm）色谱柱,20mmol/L醋酸铵水溶液-乙腈为流动相进行梯度洗脱,流速为1.0mL/min。结果得到各印油及其印迹的溶解现象及色谱图中特征峰的稳定数据。结论本方法简便、高效,可用于环保水性印油的种类区分。     

印油与印油印迹比对检验方法的影响因素研究

目的针对印油印迹形成过程中可能存在的影响因素,研究印油与印油印迹比对分析方法中可能存在的风险。方法采用溶剂提取,高速离心,过膜的简单的前处理方法,然后高效液相色谱分析,用色谱峰峰面积的相对含量来判定印油印迹与印油之间的差异。结论印泥印油、印油印迹与印油之间差异很小;而印台印油、渗透印油、翻转印油、印油与印油印迹比对时,存在一定影响。     

Micro-ATR无损检验纸张上印油

利用付立叶变换显微红外光谱法中的Micro-ATR技术无损测定了纸张上的10种红色印油,结果表明,纸张上印痕的微区衰减全反射谱图可以明显地识别其色料和溶剂的结构组成,实现有效区分不同牌号印油的目的.     

高效液相色谱法鉴别蓝色签字笔墨水的种类

目的通过对签字笔字迹成分进行检验，达到对签字笔成分进行分离并对签字笔种类进行鉴定的目的。方法使用高效液相色谱法对蓝色签字笔字迹色痕中的色料成分进行分析，并依据分析结果对墨水的种类划分，同时考察了纸张的背景影响、最小用样量以及实验结果的重现性。结果22种蓝色签字笔样品均可以实现区分。结论本研究对实际应用有较大参考价值。     

手印物质转移技术鉴别文书上伪造红印油指印

研究文书上伪造红印油指印的鉴别方法。首先，利用光敏指纹印章制作不同遗留时间的伪造红印油指印，手指直接捺印不同遗留时间的真实红印油指印。其次，利用转移介质完成真伪红印油指印的印迹物质转移，并对介质进行手印显现（茚三酮显现方法）处理，具体分为两种模式，模式一：在物质转移过程中，使红印油指印的印迹物质与转移介质上的手印显现工作液物质发生显现反应，即物质转移与显现反应同时进行；模式二：先将红印油指印中的印迹物质通过转移工作液转移至介质上，再对介质上的印迹物质进行显现处理，即先进行物质转移，后完成显现反应。最后，观察显现处理前后的转移介质上指印变化情况（有无赫鲁曼紫物质生成）。结果表明：1）模式一与模式二均成功实现红印油真伪指印物质转移及显现反应，介质上真实红印油指印位置处有赫鲁曼紫物质生成，而伪造指印无赫鲁曼紫物质生成；2）模式二的显现处理效果更优于模式一；3）采用模式二成功实现遗留时间分别为1、2、7、15、30 d的红印油指印物质转移，且转移介质经茚三酮显现处理，介质上真实红印油指印位置处均有赫鲁曼紫物质生成，伪造指印均无赫鲁曼紫物质生成。本文成功验证了真伪红印油指印的物质成分的分布存在差...     

DART-TOFMS检验红色印油初探

目的研究建立红色印油无损检验的有效鉴定方法。方法应用实时直接分析飞行时间质谱(DART-TOFMS)技术,对12个品种红色印油进行直接无损检测分析,获得样品的质谱信息。结果 2个样品组分相同不能加以区分,其余印油样品质谱区分率为100%。结论本研究建立的检测方法无损、快速、准确、无需样品前处理,可以满足物证鉴定工作对印油的检测需要。     

同步扫描荧光光谱法鉴别原子印油

本文应用同步扫描荧光光谱法,对不同生产厂家及同一厂家不同品牌的原子印油样品进行分析鉴别,依据不同样品同步扫描荧光光谱的特性,确定了较佳的实验条件.在普通荧光光谱法分析的基础上,进一步提高了检验分辨率,达到了区分不同样品的目的,为全面利用荧光光谱法区分鉴别原子印油提供了科学依据.     

拉曼光谱成像技术检验朱文时序时印文油墨种类对检验结果的影响

目的考察在运用拉曼光谱阵列面扫描检验朱文时序的方法中印文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21种印泥印油进行扫描并分类,采用拉曼光谱阵列面扫描技术对印泥印油与同一书写笔形成的朱文时序样本进行检验。结果 21种印泥印油被分为11类,21种印泥印油与蓝色签字笔形成的朱文时序样本都得到了良好的检验结果。结论印文油墨种类用拉曼光谱阵列面扫描检验朱文时序的检验结果没有影响。     

静电压痕仪检验光敏印章伪造指印初探

研究利用静电压痕仪检验光敏印章伪造指印的可行性，探究光敏印章伪造指印与手指遗留指印的静电压痕检验结果差异。以同一枚指纹为模板，分别制作8种不同光敏印油的盖、捺印指印样本及8种不同印台印油的捺印样本，用静电压痕仪对遗留5 d样本的正反面进行检验，并初步考察不同遗留时间（最长30 d）对检验结果的影响。结果表明：1）光敏印油捺印样本正面经静电压痕检验后，形成的痕迹对指印纹线的表现能力强于光敏印章盖印样本，但弱于印台印油捺印样本；2）静电压痕仪检验后的部分印台印油捺印指印，形成了超出红色印油范围的黑色补充纹线；3）光敏印油盖、捺印样本经静电压痕仪检验后，印痕周围均出现光晕状痕迹；4）静电压痕仪检验后，少数光敏印章盖印指印周围出现不完整章面印痕；5）对样本背面进行静电压痕检验，光敏印油盖、捺印样本均可显现出明显指印印痕，且边缘出现明显光晕状痕迹，印台印油捺印样本背面痕迹不明显；6）样本遗留30 d时，仍然能够依据上述5条实验现象对三类样本进行区分。静电压痕检验一定程度上能作为纸张上光敏印章伪造指印的有效检验方法之一，但还需就遗留时间、印油种类、盖印/捺印力度、章体新旧程度等因素对检验结果的影响...     

薄层色谱法鉴别黑色中性笔色痕的种类

黑色中性笔墨水主要由溶剂、色料、增稠剂、稳定剂和其他添加剂等组成,不同厂家或同厂家不同牌号中性笔墨水的成分不同,尤其是色料差别较大,这为中性笔墨水的种类鉴别提供了依据。本文利用数理统计中的均匀设计法和正交设计法安排试验,建立了一种可用于黑色中性笔色痕种类鉴别的方法:用N,N-二甲基甲酰胺作为黑色中性笔色痕的提取剂,四氢呋喃:甲醇:1,2-二氯乙烷:氯仿=30:15:5:7为展开剂的薄层色谱分析法。     

拉曼光谱成像技术检验朱墨时序中书写笔种类对检验结果的影响研究

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。     

自含墨印章印文盖印时间受老化条件的影响

目的探索利用气相色谱法较精确、定量测定自含墨印章印文盖印时间受人为老化条件的影响。方法分别在恒温烘烤、紫外线照射、纯水浸泡等人为老化条件下,测定自含墨印章印油中所含有的主要相关溶剂成份的含量变化。结果得出了主要溶剂成份在人为老化条件下其含量的变化规律以及人为老化与自然老化的对应关系。结论利用气相色谱法可以对不同保存条件下自含墨印章印文的盖印时间进行测定,为实际相关案件的检验提供了依据。     

Preliminary Studies on the Absorbance Ratio Method Used to Determining the Age of Stamp‐pad Ink Seal

Stamp‐pad ink seals are often placed on important documents, and determining the dating of stamp‐pad ink seal is important to assess the authenticity of a document. In this study, 20 different brands and types of stamp‐pad inks were classified by ultraviolet visible spectrophotometer. Six different brands and types of papers were classified by micro‐Fourier transform infrared spectrometer and visual spectral comparator 6000. Three different brands of stamp‐pad inks and two different types of paper were used to make diachronic samples of the seals. A method was employed to date the stamp‐pad seals by comparing absorbance ratios and inks of known age. Curves were created to show the relationship between the absorbance ratio of ink and the age of the seals. The experimental results showed that the absorbance ratio method was applicable for the relative dating of stamp‐pad ink seals in some cases where the seal was placed on the document within 10 weeks.     

Dating of Seals Produced with Stamp‐Pad Ink Using Gas Chromatography Method

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.     

Preliminary Study on Determining the Sequence of Intersecting Lines by Fluorescence Technique

The determination of the sequence of intersecting lines is an important part of questioned document examinations. A fluorescence technique was used to determine the sequence of heterogeneous intersecting lines produced using inkpad ink, stamp‐pad ink, ballpoint pens, gel pens, fountain pens, colorants of carbon paper, photocopiers, laser printers, and inkjet printers. A SteREO Discovery.V20 equipped with the ZEN Blue Lite software was chosen to perform the tests.As the results obtained from the study were positive under most conditions, the fluorescence technique was found to be very successful in determining the sequence of intersecting lines from ballpoint pen, gel pen, fountain pen, photocopier, laser and inkjet printers, and inkpad inks. The method was also successful in determining the sequence of intersecting lines from ballpoint pen, photocopier, laser printer, and stamp‐pad inks under most conditions. The technique was not successful in determining the order of crossing lines blending together.     

Application of Raman spectroscopy in forensic investigation of questioned documents involving stamp inks

Stamp pad inks from different manufacturers across India have been analyzed to investigate the feasibility of Raman scattering as a tool for forensic analysis of questioned documents involving stamp inks. Nine different stamping inks were analyzed by both Raman spectroscopic and HPTLC methods. The results demonstrate the effectiveness of these methods in classifying the investigated stamping inks based on their spectral pattern and HPTLC chromatogram. Raman scattering tool was able to determine the sequence of heterogeneous intersection strokes involving a blue stamp pad ink and other writing instruments, such as ballpoint pen ink (red and black), pencil and laser printer toner. However, this method was unable to resolve the exact sequencing for the intersection strokes involving investigated stamp ink and blue ballpoint ink or gel pen ink (all colors).     

印文鉴定相关问题探讨——高仿真印文鉴定

当前,与印文鉴定相关的并在鉴定实践中经常遇到的新问题和难点问题有高仿真印文的鉴定、变造印章问题、利用真实印文变造文件、同版印章印文、朱墨时序等,本文就高仿真印文的鉴定进行了系统阐述,介绍了各种高仿真印文,包括各种高仿真印章的盖印印文、复制印文、转印印文的伪造手段及其特点,并提出了高仿真印文的鉴定思路和要点。     

HPLC analysis of ballpoint pen inks stored at different light conditions

A method for comparison of ink entries on documents stored in different light conditions is presented. Various blue inks were exposed to light, both daylight and artificial light from fluorescent tubes. Inks were then extracted from the document and analyzed by HPLC (high performance liquid chromatography). Significant changes in composition were noted on exposure to light. These changes were followed by using ternary diagrams constructed for dyes generally present in blue-colored inks--Crystal Violet, Methyl Violet, and Tetramethyl Para Rosaniline. Also, the amount of the various compounds formed by decomposition of these dyes on exposure to light was measured and employed for comparison of inks. An example of the use of the proposed method in casework is given.     

丝网版印章印文特征辨析

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。