彩色红外紫外鉴别仪——850nm红外/365nm紫外/白光三模式·10倍光学放大·透射光辅助·便携一体化文件防伪与变造痕迹快速检验系统（司法鉴定文件检验/刑事技术现场初筛/银行票据安检鉴别设备）

 

彩色红外紫外鉴别仪——850nm红外/365nm紫外/白光三模式·10倍光学放大·透射光辅助·便携一体化文件防伪与变造痕迹快速检验系统（司法鉴定文件检验/刑事技术现场初筛/银行票据安检鉴别设备）

〖重要合规前置声明〗 本产品为国家管制类文件检验与刑事技术专用特种装备，仅面向具备法定鉴定资质与文件检验许可的各级公安机关刑事技术部门、人民检察院技术部门、司法鉴定机构、银行安全保卫部门及授权文件检验实验室定向研发、生产与供应，严禁向任何个人、无资质企业及非授权单位销售或提供。本设备的购置、使用与管理，必须严格遵守《中华人民共和国刑事诉讼法》《司法鉴定程序通则》及国家关于文件检验、货币与票证管理的相关法律法规与行业技术标准，必须由经过专业培训、取得相应文件检验或刑事技术岗位资质的人员规范操作，严禁无资质单位和个人违规获取、使用本设备，严禁将本设备用于伪造货币、变造票证或其它非法活动，严禁将设备检测到的文件防伪特征信息用于非法目的。

产品概述

彩色红外紫外鉴别仪——850nm红外/365nm紫外/白光三模式·10倍光学放大·透射光辅助·便携一体化文件防伪与变造痕迹快速检验系统（亦称彩色红外紫外鉴别仪、便携式文件检验仪）是一款集红外、紫外及白光观察于一体的便携式多功能文件检验仪器，属于司法鉴定文件检验、刑事技术现场初筛及银行安检领域的核心便携式光学检验装备。该产品通过整合850nm红外波长与365nm紫外波长的探测能力，结合10倍光学放大与白光透射照明，专为快速、有效地对文件的防伪特征、涂改痕迹、消退字迹、挖补刮擦及墨水红外吸收差异进行现场鉴别深度定制，完美适配钞票、护照、票据的防伪特征快速查验，合同、证件、借据的变造痕迹初步检验，以及实验室辅助检验与数字化取证等多种专业工作场景。设备将红外/紫外/白光三模式光源、10倍光学放大镜头、7英寸液晶显示器及透射照明平台高度集成于便携式机身内，实现“所见即所得”的直观操作体验，从根本上解决了传统大型文检仪无法携带至现场、单一光源无法满足多类型变造手段全面筛查、以及需外接计算机导致部署准备时间过长等实战痛点，能够为文件检验鉴定人及现场勘查人员提供“红外紫外一体化、光学放大细节清晰、透射光揭示物理变造、开机即用无需外接”的快捷现场初筛能力，是文件真伪鉴别与变造痕迹检验领域的实用核心装备。

技术原理

该设备基于多波段光谱选择性吸收/激发与光学放大成像协同工作的复合原理。在光源层面，设备集成三个独立光学通道：850nm红外光源发射近红外波段光束，照射文件表面时，不同墨水及印刷油墨因化学成分差异对红外光呈现选择性吸收或透过的特性——部分墨水在红外线下完全透明而另一部分保持深色吸收，从而清晰显现红外吸收差异，揭露添写、改写及不同墨料的交叉笔迹顺序；365nm紫外光源发射长波紫外光束，激发文件纸张中的荧光增白剂、某些墨水染料及化学消退试剂残留物产生可见荧光，使被化学消退的原始字迹、密写内容及荧光防伪纤维丝在暗背景下凸显；白光反射与透射照明则提供常规观察及背光透视条件——透射模式下光线从文件背面穿透纸张，水印图案、纸张厚度变化、纤维分布不均、挖补接痕及刮擦区域的结构破坏清晰可辨。

光源照射产生的光学图像经10倍光学放大镜头聚焦成像，在40mm工作距离下提供清晰的文件微观细节——包括印刷文字的笔画边缘、印章印文的油墨堆积形态、安全线的编织纹理及微缩文字的辨识度。图像信号实时显示于设备集成的7英寸液晶显示器上，操作者无需外接计算机即可直接观察并调整文件位置与焦距。设备支持通过USB接口连接选配图像采集棒至计算机，将关键鉴别图像以数字格式采集、存储并打印，作为检验报告的规范附件归档。

核心功能与合规实战价值

红外/紫外/白光三模式一体化集成，覆盖常见文件变造手段的全谱系快速筛查
设备在单一便携式机身内集成850nm红外、365nm紫外及白光反射/透射三种独立光学检验通道，操作者通过简单切换即可在同一观察工位上完成对同一份文件的多维度光学初筛。红外模式用于鉴别墨水异同、检测添写改写及观察深层印刷特征；紫外模式激发荧光纤维丝、显现化学消退残留及密写痕迹；白光透射模式揭示水印、挖补、刮擦及纸张厚度异常等物理变造手段。该三模式一体化集成能力使文件检验人员无需在多台设备之间切换检材，在一台仪器上即可完成从防伪特征验证到笔墨异同鉴别再到物理变造痕迹发现的完整光学初筛工作流程，检验效率显著提升，现场初筛结论作为是否送实验室进一步鉴定的决策依据，完全符合文件检验“先无损、后有损”的标准检验顺序原则。

10倍光学放大与7英寸集成显示，实现“所见即所得”的现场清晰微观检视
设备搭载10倍光学放大镜头，在40mm工作距离下可清晰呈现票证微缩文字、印章印文边框细节、钞票凹版印刷线条及字迹笔画边缘的微观形态特征。图像直接显示于7英寸集成液晶显示器上，色彩还原真实，操作者在放大观察时所见即为文件对应区域的实时光学画面，区别于传统需单眼通过目镜观察的便携检验仪，避免了长时间观察的眼部疲劳，同时便于多名鉴定人或办案人员在同一屏幕上同步观察讨论。该直观显示方式使现场搜查或柜台验票中需要当场作出真伪判断的紧急场景下，操作者能够快速定位可疑区域并形成初步鉴定意见，为后续处置措施的及时采取提供光学层面的技术依据。

白光透射辅助照明，揭示物理变造痕迹与纸质载体特征
设备配备白光透射照明平台，将文件置于透射光源上方，光线从背面穿透纸张，水印图案的完整轮廓、金属安全线的位置及形态、纸张纤维分布的不规则性、挖补区域的拼接接痕以及刮擦区域的纸纤维减薄痕迹均清晰可辨。该透射检验模式有效补充了反射光观察仅能探测表面墨迹差异的局限，将检验维度从二维表面墨迹扩展至三维纸张载体结构，为发现物理变造手段提供了直观且不可替代的光学检验条件，完整的透射光检查已是文件检验技术规范中标准初筛程序的必要环节。

USB图像采集扩展与数字化归档，支撑检验报告的规范化制作
设备支持通过USB接口连接选配图像采集棒至计算机，操作者在鉴别过程中发现具有证据价值的关键图像——如红外模式下显现的添写笔迹、紫外模式下激发的荧光消退痕迹、透射模式下清晰可见的挖补接痕等——可即时以数字格式采集并存储，用于后续制作文件检验鉴定报告的技术附件。该数字化采集能力使便携式现场初筛设备具备了与实验室大型文检仪相衔接的证据固定接口，现场所获光学检验图像经规范采集及哈希校验后可纳入鉴定档案，满足司法鉴定关于检验记录完整性与图像证据可追溯性的规范要求，为初筛结论在法庭上的出示提供了经得起技术审查的可视化证据支撑。

合规应用场景

文件真伪快速鉴别场景：钞票、护照、证件及票据防伪特征查验
在银行柜面、海关出入境窗口或公安临时检查点，操作人员使用本设备对可疑钞票的水印、安全线、凹版印刷及荧光纤维丝等防伪特征进行红外/紫外/透射多模式查验；对护照个人信息页的防伪底纹、光变油墨及生物特征芯片嵌入痕迹进行放大观察，快速判断证件是否被替换照片、篡改信息或整体伪造。多波段检验结果的组合判读较大程度降低了单一光源检验可能产生的误判风险，为当场依法作出扣押、移交或放行决定提供及时可靠的技术依据。

变造文件现场初筛场景：添加、涂改、消退及伪造印章痕迹检验
在刑事搜查、经济案件调查或内部审计中，勘查人员使用本设备对查获的合同、借据、账本、遗嘱等可疑文件进行现场初步光学检验。红外模式下观察是否存在不同墨水添加或改写笔迹，紫外模式下检查是否留有化学消退试剂残留的荧光痕迹，透射模式下对怀疑被挖补或刮擦的区域进行纸张结构完整性检查。初筛发现的可疑痕迹当场标记并拍照固定，作为进一步送实验室进行理化检验或笔迹鉴定的决策依据，现场检验过程无损检材原始状态，完全遵循文件检验技术规范要求。

司法鉴定机构文件检验辅助与教学培训场景
在司法鉴定机构的文件检验实验室，本设备作为大型文检仪的日常补充设备，用于鉴定人快速预览检材、筛选需重点检验的可疑区域及培训新入职鉴定人的基础操作技能。其便携性与操作直观性使学员能够在短时间内掌握红外、紫外及透射光三种基本光学检验方法的使用与结果判读，为进阶大型文检仪操作奠定基础。

核心技术参数

检测波段方面，设备内置850nm红外光源与365nm紫外光源两个独立光学检验通道，配合白光反射及透射照明，实现三种光学检验模式协同工作。光学系统方面，配备10倍光学放大镜头，工作距离40mm，可清晰呈现文件微观细节。显示系统方面，集成7英寸液晶显示器，图像色彩还原真实，实现“所见即所得”的直观操作体验。电源方面，采用AC 220V输入、DC 12V稳压输出的电源适配器供电。扩展功能方面，支持通过USB接口连接选配图像采集棒至计算机，进行关键图像的数字化采集、存储与打印。

合规实战应用案例

某市人民法院在审理一宗民间借贷纠纷再审案件时，原告与被告对一张关键借据上“借款金额”处手写数字是否存在事后变造产生重大争议。法院委托该市司法鉴定中心进行文书鉴定。鉴定人受理检材后，为快速了解争议区域的光学特征，首先使用本彩色红外紫外鉴别仪进行现场初步筛查。在红外模式下，鉴定人清晰观察到争议数字“捌萬”区域与原文其他字迹对红外光吸收程度存在明显差异，部分笔画呈现透明状态而原文字迹保持深色；在紫外模式下，争议区域隐约可见不规则荧光反应，边缘形态不符合正常书写规律；透射光模式下，字迹区域纸张纤维未见刮擦减薄痕迹。鉴定人通过USB采集棒将上述多波段观察的关键画面实时采集存档，作为后续大型文检仪精细检验及出具鉴定意见书的技术附件。经后续实验室仪器确证，该借据金额数字确系事后添写形成，法庭采信了鉴定结论，依法改判。本案中便携鉴别仪在鉴定受理阶段发挥的快速初筛与图像固定作用得到了鉴定中心在技术总结中的肯定。

某市公安局经侦支队在侦办一起特大虚开增值税专用发票案时，依法对涉案企业财务室进行搜查。现场查获大量增值税发票、采购合同及记账凭证，需现场快速初筛是否存在伪造发票及变造合同。侦查人员携带本彩色红外紫外鉴别仪进入现场，利用红外模式对发票的税务监制章与发票号码印刷油墨进行同屏比对，发现多份发票的号码区域在红外光下呈现与标准发票明显不同的吸收特征；紫外模式下，部分发票的荧光纤维丝颜色与标准样本存在差异。侦查人员利用USB采集棒对可疑区域逐份拍照留存，初步判定为伪造发票后当场对该批发票进行分类扣押封存，规范的程序化操作保障了现场电子数据与可疑物证的快速分离，为案件后续侦查取证奠定了基础。

厂家信息：北京毕思特联合科技有限公司
网址：https://www.bestlh.com
地址：北京市亦庄开发区经海六路一号院尖子班 C9 独栋
电话：010-56526048

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Color Infrared Ultraviolet Document Examination System — 850nm IR / 365nm UV / White Light Triple-Mode · 10x Optical Magnification · Transmitted Light Auxiliary · Portable Integrated Document Anti-Counterfeiting & Alteration Trace Rapid Inspection System (Judicial Forensic Document Examination / Criminal Technical On-Site Preliminary Screening / Bank Note Security Inspection & Identification Equipment)

Global site URL：https://xilankeji.en.alibaba.com

〖Important Compliance Precaution〗 This product is a state-controlled specialized equipment for document examination and criminal technology, which is solely developed, produced and supplied to authorized entities such as criminal technical departments of public security organs, technical departments of people's procuratorates, forensic identification institutions, bank security departments, and authorized document examination laboratories with statutory identification qualifications and document examination permits. Any sale or supply to individuals, non-qualified enterprises and unauthorized units is strictly prohibited. The procurement, use and management of this equipment must strictly comply with the Criminal Procedure Law of the People's Republic of China, the General Rules for Judicial Authentication Procedures, and national laws, regulations and industrial technical standards regarding document examination and currency and negotiable instrument management. Operation must be carried out exclusively by professionally trained personnel holding corresponding document examination or criminal technical post qualifications. Unauthorized units and individuals are strictly forbidden from acquiring or using this equipment. Any use of this equipment for counterfeiting currency, altering negotiable instruments, or other illegal activities, as well as the use of detected document security feature information for illegal purposes, is strictly prohibited.

Product Overview

The Color Infrared Ultraviolet Document Examination System — 850nm IR, 365nm UV, White Light Triple-Mode, 10x Optical Magnification, Transmitted Light Auxiliary, Portable Integrated Document Anti-Counterfeiting & Alteration Trace Rapid Inspection System (also referred to as the Color Infrared Ultraviolet Document Examination Instrument or Portable Document Examination Instrument) is a portable multi-functional document examination instrument integrating infrared, ultraviolet, and white light observation. It constitutes a core portable optical examination equipment in the fields of judicial forensic document examination, criminal technical on-site preliminary screening, and bank security inspection. By integrating the detection capabilities of 850nm infrared wavelength and 365nm ultraviolet wavelength, combined with 10x optical magnification and white light transmitted illumination, this product is deeply customized for the rapid and effective on-site identification of document security features, alteration traces, erased writing, erasures, scrapings, and infrared absorption differences of inks. It perfectly adapts to various professional work scenarios, including the rapid inspection of security features on banknotes, passports, and negotiable instruments; the preliminary examination of alteration traces on contracts, certificates, and IOU notes; and auxiliary laboratory examination and digital evidence collection. The device highly integrates a triple-mode IR/UV/white light source, a 10x optical magnification lens, a 7-inch LCD monitor, and a transmitted illumination platform into a single portable body, achieving an intuitive "what you see is what you get" operating experience. This fundamentally resolves the operational pain points of traditional large document examination instruments being unable to be brought to the scene, single light sources being insufficient for comprehensive screening of various types of alterations, and the lengthy deployment preparation time caused by the need for an external computer. It provides document examiners and on-site investigators with "integrated infrared and ultraviolet, clear optical magnification for details, transmitted light revealing physical alterations, ready to use upon startup without external connections" rapid on-site preliminary screening capability. It is a practical and core piece of equipment in the field of document authenticity and alteration trace examination.

Technical Principle

This device operates on the combined principle of multi-band spectral selective absorption/excitation and optically magnified imaging working in synergy. At the light source level, the device integrates three independent optical channels: the 850nm infrared light source emits a near-infrared band beam. When irradiating the document surface, different inks and printing inks exhibit selective absorption or transmission of infrared light depending on their chemical composition—some inks become completely transparent under infrared light while others remain darkly absorptive, thereby clearly revealing differences in infrared absorption and exposing added or altered writing and the sequence of intersecting strokes from different inks. The 365nm ultraviolet light source emits a long-wave ultraviolet beam, exciting optical brighteners in the document paper, certain ink dyes, and chemical erasure reagent residues to produce visible fluorescence, causing chemically erased original writing, secret writing, and fluorescent security fibers to stand out against a dark background. White light reflective and transmitted illumination provides conditions for conventional observation and backlighting—in transmitted light mode, light penetrates the paper from the back, making the watermark pattern, variations in paper thickness, uneven fiber distribution, patching seams, and structural damage in scraped areas clearly discernible.

The optical image produced by the light source irradiation is focused and imaged by a 10x optical magnification lens, providing clear microscopic details of the document at a 40mm working distance—including the stroke edges of printed text, the ink accumulation morphology of stamp impressions, the weaving texture of security threads, and the legibility of micro-printing. The image signal is displayed in real-time on the device's integrated 7-inch LCD monitor. The operator can directly observe and adjust the document's position and focus without the need for an external computer. The device supports connecting an optional USB image capture dongle to a computer via a USB interface, allowing key identification images to be captured, stored, and printed in digital format for standardized attachment to the examination report for archiving.

Core Functions and Compliance Operational Value

Triple-Mode IR/UV/White Light Integrated Integration, Covering the Full Spectrum of Rapid Screening for Common Document Alteration Methods
The device integrates three independent optical examination channels—850nm infrared, 365nm ultraviolet, and white light reflective/transmissive—within a single portable body. By simple switching, the operator can complete a multi-dimensional optical preliminary screening of the same document at the same observation workstation. The infrared mode is used to identify ink differences, detect additions and alterations, and observe deep printing features; the ultraviolet mode excites fluorescent security fibers, reveals chemical erasure residues and secret writing traces; the white light transmission mode reveals physical alteration methods such as watermarks, patching, erasures, scrapings, and paper thickness anomalies. This triple-mode integrated capability allows the document examiner to complete a full optical preliminary screening workflow—from verification of security features to discrimination of ink differences to the discovery of physical alteration traces—on a single instrument without switching evidence between multiple devices. Examination efficiency is significantly enhanced. The on-site preliminary screening conclusion, serving as the decision-making basis for whether to submit for further laboratory identification, fully complies with the standard document examination principle of "non-destructive first, destructive later."

10x Optical Magnification and 7-Inch Integrated Display, Achieving "What You See Is What You Get" Clear Microscopic On-Site Inspection
The device is equipped with a 10x optical magnification lens. At a 40mm working distance, it can clearly present the micro-printing on negotiable instruments, the border details of stamp impressions, the intaglio printing lines on banknotes, and the microscopic morphological characteristics of stroke edges. The image is directly displayed on the 7-inch integrated LCD monitor with true color reproduction. What the operator sees during magnified observation is the real-time optical image of the corresponding area of the document. This differs from traditional portable examination instruments that require monocular observation through an eyepiece, avoiding eye fatigue from prolonged observation. It also facilitates multiple examiners or investigators to synchronously observe and discuss on the same screen. This intuitive display method enables the operator, in urgent scenarios requiring immediate on-site authenticity judgment during searches or counter ticket verification, to quickly locate suspicious areas and form a preliminary expert opinion, providing a technical basis at the optical level for the timely implementation of subsequent measures.

White Light Transmitted Auxiliary Illumination, Revealing Physical Alteration Traces and Paper Substrate Characteristics
The device is equipped with a white light transmitted illumination platform. When the document is placed over the transmitted light source, light penetrates the paper from the back, making the complete outline of the watermark, the position and form of the metallic security thread, the irregularity of paper fiber distribution, the splicing seams of patched areas, and the paper fiber thinning traces in scraped areas all clearly discernible. This transmitted light examination mode effectively supplements the limitation of reflective light observation, which can only detect surface ink differences. It extends the examination dimension from two-dimensional surface ink to the three-dimensional paper substrate structure, providing an intuitive and irreplaceable optical examination condition for discovering physical alteration methods. A complete transmitted light examination is already a necessary step in the standard preliminary screening procedure within document examination technical specifications.

USB Image Capture Expansion and Digital Archiving, Supporting the Standardized Production of Examination Reports
The device supports connecting an optional USB image capture dongle to a computer via a USB interface. When the operator discovers key images with evidentiary value during the identification process—such as added handwriting revealed in infrared mode, fluorescent erasure traces excited in ultraviolet mode, and clearly visible patching seams in transmitted light mode—they can be instantly captured and stored in digital format. These can subsequently be used to produce the technical appendices for the document examination expert report. This digital capture capability provides the portable on-site preliminary screening equipment with an evidence preservation interface that connects with large-scale laboratory document examination instruments. The on-site optically obtained examination images, after standardized capture and hash verification, can be incorporated into the forensic case file. This satisfies the normative requirements of forensic identification regarding the completeness of examination records and the traceability of image evidence, providing visual evidence support that can withstand technical scrutiny when the preliminary screening conclusion is presented in court.

Compliant Application Scenarios

Rapid Document Authenticity Identification Scenario: Inspection of Security Features on Banknotes, Passports, Certificates, and Negotiable Instruments
At bank counters, customs immigration windows, or temporary police checkpoints, operators use this device to conduct multi-mode IR/UV/transmissive inspection of security features on suspicious banknotes, such as watermarks, security threads, intaglio printing, and fluorescent security fibers. They perform magnified observation of the security background patterns, optically variable ink, and biometric chip embedding traces on passport personal information pages, rapidly determining whether the document has undergone photo substitution, information alteration, or overall counterfeiting. The combined interpretation of multi-band examination results significantly reduces the risk of misjudgment that might arise from single-light-source examination, providing a timely and reliable technical basis for making lawful decisions on the spot, such as seizure, transfer, or release.

Altered Document On-Site Preliminary Screening Scenario: Examination of Addition, Alteration, Erasure, and Counterfeit Stamp Impressions
During criminal searches, economic crime investigations, or internal audits, investigators use this device to conduct on-site preliminary optical examination of suspicious documents such as contracts, IOU notes, account books, and wills found at the scene. Infrared mode is used to observe whether there is added or altered handwriting using different inks; ultraviolet mode is used to check for fluorescent traces left by chemical erasure reagents; transmitted light mode is used to inspect the structural integrity of the paper in areas suspected of being patched or scraped. Suspicious traces discovered during the preliminary screening are marked and photographed on the spot for preservation. These serve as the decision-making basis for whether to proceed with further laboratory physicochemical testing or handwriting identification. The on-site examination process is non-destructive to the original state of the evidence and fully complies with the requirements of document examination technical standards.

Auxiliary Document Examination and Teaching & Training Scenario in Forensic Identification Institutions
In the document examination laboratory of a forensic identification institution, this device serves as a daily supplementary tool to large document examination instruments. It is used by examiners to quickly preview evidence, screen for suspicious areas requiring focused examination, and train newly recruited examiners in basic operational skills. Its portability and operational intuitiveness enable trainees to master the use and result interpretation of the three basic optical examination methods—infrared, ultraviolet, and transmitted light—within a short period, laying the foundation for advanced operation of large-scale document examination instruments.

Core Technical Parameters

In terms of detection wavebands, the device features two independent optical examination channels: a built-in 850nm infrared light source and a 365nm ultraviolet light source, working in synergy with white light reflective and transmitted illumination to realize three optical examination modes. For the optical system, a 10x optical magnification lens is provided, with a working distance of 40mm, capable of clearly presenting microscopic document details. For the display system, a 7-inch LCD monitor is integrated, offering true color reproduction and an intuitive operational experience of "what you see is what you get." The power supply uses a dedicated power adapter with AC 220V input and DC 12V regulated output. For expansion functionality, it supports connecting an optional USB image capture dongle via a USB interface to a computer for the digital capture, storage, and printing of key images.

Compliant Field Application Cases

During the retrial of a private lending dispute case at a municipal people's court, a major dispute arose between the plaintiff and defendant over whether the handwritten numerals in the "loan amount" field on a key IOU had been subsequently altered. The court commissioned the city's judicial identification center to conduct a document examination. Upon accepting the evidence, the examiner first used this Color Infrared Ultraviolet Document Examination Instrument to conduct a rapid preliminary on-site screening to quickly understand the optical characteristics of the disputed area. In infrared mode, the examiner clearly observed significant differences in the degree of infrared light absorption between the disputed numeral area "捌萬" and the rest of the original handwriting. Some strokes appeared transparent while the original handwriting remained dark. In ultraviolet mode, an irregular fluorescent reaction was faintly visible in the disputed area, with edge morphology not conforming to normal writing patterns. In transmitted light mode, no scraping or thinning traces were visible in the paper fibers of the writing area. The examiner used a USB capture dongle to capture and archive the key images from the above multi-band observations in real time, to be used as a technical appendix for subsequent detailed examination with a large document examination instrument and for generating the expert report. Subsequent laboratory instrumental examination confirmed that the loan amount numerals on the IOU had indeed been added afterwards. The court admitted the identification conclusion and amended the judgment according to law. In this case, the role played by the portable identification instrument in rapid preliminary screening and image preservation during the case acceptance stage was affirmed by the identification center in their technical summary.

During the investigation of a major case involving the false issuance of special VAT invoices, the economic crime investigation detachment of a municipal public security organ lawfully conducted a search of the financial office of the involved enterprise. A large quantity of VAT invoices, purchase contracts, and accounting vouchers were seized at the scene. Rapid on-site preliminary screening was needed to determine if there were any counterfeit invoices or altered contracts. Investigators brought this Color Infrared Ultraviolet Document Examination Instrument into the scene. Using infrared mode, they performed side-by-side comparisons on the same screen of the tax supervision stamps and invoice number printing inks on the invoices. They found that the numbering areas on several invoices exhibited distinctly different absorption characteristics under infrared light compared to standard invoices. Under ultraviolet mode, the color of the fluorescent security fibers in some invoices differed from the standard sample. The investigators used a USB capture dongle to photograph and save each suspicious area. Upon preliminary determination of counterfeiting, they immediately categorized, seized, and sealed these invoices on the spot. The standardized procedural operation ensured the rapid separation of on-site electronic data and suspicious physical evidence, laying the groundwork for the subsequent investigation and evidence collection of the case.

Manufacturer Information: Beijing Best United Technology Co., Ltd.
Website: https://www.bestlh.com
Address: Building C9, Jianziban, No.1 Courtyard, Jinghai Sixth Road, Yizhuang Development Zone, Beijing
Tel: 010-56526048