基于积分光密度的印文墨迹历时变化初步研究

目的 探讨利用积分光密度值判断印文形成时间的可行性,方法通过实验,利用Image-pro plus软件对不同时间段实验样本的印文积分光密度值数据进行采集、录入,并运用相关数据分析方法,对实验用三种品牌印油、印泥盖印印文的积分光密度值数据进行统计、分析.结果 发现在1～120d间数值下降速度较快,在120～380d间数值...     

TDS-GC/MS法检测黑色中性笔墨迹中挥发性溶剂的历时性变化

目的 应用热脱附-气相色谱/质谱(TDS-GC/MS)分析,研究7支黑色中性笔墨迹中挥发性溶剂的历时性变化规律.方法 选取7支不同品牌的黑色中性笔,分别在A4纸和笔记本上进行一次制样,然后在不同时间点取样,应用所建TDS-GC/MS方法分析墨迹中乙二醇、二甘醇和三甘醇在200余天内的含量变化.结果 6支笔中的乙二醇、三...     

蓝色圆珠笔字迹色痕FT-IR光谱经时变化的研究

笔者曾用FT-IR光谱法对108种不同蓝色圆珠笔油墨进行了系统分析,确定了油墨组成成份,实现了种类认定.在此基础上,选取了二种不同种类的蓝色圆珠笔油墨字迹色痕,在紫外光下定时照射,根据各自光谱特征峰校正峰高的计算,确定相关峰的相对峰高比.根据相对峰高比值随时间变化的规律,进行了曲线拟合和计算机编程.同时,探讨了油墨组份之间随光照时间的变化,其目的是为了推断字迹色痕的“年龄”.     

Differentiating writing inks using direct analysis in real time mass spectrometry

Writing ink analysis is used in establishing document authenticity and the sources and relative ages of written entries. Most analytical methods require removing samples or visibly altering the document. Nondestructive, in situ analysis of writing inks on paper without visible alteration is possible using mass spectrometry with a new ion source called Direct Analysis in Real Time. Forty-three different black and blue ballpoint, black fluid, and black gel inks were examined. Both dyes and persistent but thermally labile components of the inks contribute to the mass spectra, principally as protonated molecules [M+H](+). Numerous ink components were identified from the spectra. The spectra were placed in a searchable library, which was then challenged with two spectra from each of the 43 inks. The best match for each of the challenge spectra was correct for all but one ink, which matched with a very similar ink by the same manufacturer.     

书写材料的红外区吸收与发光的研究

介绍了书写材料在红外波段吸收与发光的实验研究结果,发现对于书写材料其最佳激发波段恰好是反射曲线中的吸收峰.橙红色光的激发效果很好,拓宽了激发光的范围.     

印油印迹中色料成分的UHPLC方法研究

目的对红色印油印迹色料成分进行分析,研究确定印油印迹的种类区分方法,为侦查破案提供依据。方法采用超高效液相色谱法分析,以保留时间为主进行定性,对35种不同品牌的印油产品中色料成分进行区分。结果将印油印迹分为普通印油（印泥、原子印油等）、水性印油及光敏印油三类,建立了统一的UHPLC分析方法,其种类区分率达85%以上。结论通过印油印迹成分研究,最终区分印油印迹种类,可满足实际案件中对不同类型印油的鉴别区分。     

万用表测量字迹电阻方法的初步研究

目的介绍一种鉴定添加变造黑色笔迹的新方法—万用表测量字迹电阻法。方法用万用表的探针测量字迹笔画的电阻值数值,根据数值的大小范围来判断字迹是否存在添加变造。结果该方法简便快速,不破坏原件,不受检测条件及环境的限制,成本低,效率高,便于广泛推广应用。结论凡是可测出电阻值数值的,证明书写色料中的成份是以碳黑为主,凡电阻值为正无穷大时,证明书写色料中不含碳黑,而是由多种色料拼色而成的,从而可分析判断字迹是否被添加变造。     

印章色料及其色痕检验方法回顾与展望

对印章色料种类、廖分进行了简介，并对印章色料及其色痕检验方法研究的进展情况亦作了介绍，借此，还展望了对印章色料及其色痕新的检验方法。     

光敏印章盖印印文的检验

光敏印章盖印印文是司法鉴定中涉及真伪鉴别的一类新型印文。课题组以调研、实验研究、个案鉴定的积累为基础,对这类印章印文的特点和检验要点进行了操作层面的探讨。     

Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy Analysis of Red Seal Inks on Questioned Document

Seals are traditionally used in the Far East Asia to stamp an impression on a document in place of a signature. In this study, an accuser claimed that a personal contract regarding mining development rights acquired by a defendant was devolved to the accuser because the defendant stamped the devolvement contract in the presence of the accuser and a witness. The accuser further stated that the seal ink stamped on the devolvement contract was the same as that stamped on the development rights application document. To verify this, the seals used in two documents were analyzed using micro‐attenuated total reflectance Fourier transform infrared spectroscopy and infrared spectra. The findings revealed that the seals originated from different manufacturers. Thus, the accuser's claim on the existence of a devolvement contract was proved to be false.