GA/T 1956-2021 English PDF

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GA/T 1956-2021: Forensic sciences - Specifications for examination of printed documents
Status: Valid

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Basic data

Standard ID: GA/T 1956-2021 (GA/T1956-2021)
Description (Translated English): Forensic sciences - Specifications for examination of printed documents
Sector / Industry: Public Security (Police) Industry Standard (Recommended)
Classification of Chinese Standard: A92
Word Count Estimation: 7,774
Issuing agency(ies): Ministry of Public Security

GA/T 1956-2021: Forensic sciences - Specifications for examination of printed documents

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Forensic sciences - Specifications for examination of printed documents ICS 13.310 CCSA92 People's Republic of China Public Safety Industry Standards Forensic Science Printed Document Inspection Specification Published on 2021-10-14 2022-05-01 Implementation Published by the Ministry of Public Security of the People's Republic of China

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. Please note that some content of this document may be patented. Publication of this document Institutions do not assume responsibility for identifying patents. This document is proposed by the National Criminal Technology Standardization Technical Committee Document Inspection Sub-Technical Committee (SAC/TC179/SC10) and focal point. This document is drafted by. Hebei Provincial Public Security Bureau Material Evidence Identification Center, Ministry of Public Security Material Evidence Identification Center, Wuxi Municipal Public Security Bureau, China Criminal Police Academy Hospital, Jiangsu Police Academy, Criminal Science and Technology Research Institute of Nanjing Public Security Bureau, Physical Evidence Identification Center of Shandong Public Security Bureau, Yantai Public Security Bureau Criminal Science and Technology Research Institute, Hunan Provincial Procuratorate, Shijiazhuang Municipal Public Security Bureau Criminal Science and Technology Research Institute. The main drafters of this document. Chen Liqing, Sui Juntao, Wang Jian, Han Xingzhou, Hao Hongguang, Wang Xiaoguang, Wang Yun, Yu Bin, Liu Ning, Xu Weiwei, Wang Wei, Han Wei, Luo Yaqin, Liu Yang, Chu Bingsheng. Forensic Science Printed Document Inspection Specification

1 Scope

This document specifies common printing documents and their characteristics in the field of forensic science, printing characteristics, inspection methods, preliminary preparations, inspection procedures, printing Feature selection, print feature analysis, and identification comments. This document is intended for inspection of printed documents in the field of forensic science.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. GB/T 34919-2017 Technical regulations for the inspection of printed documents in forensic science

3 Terms and Definitions

There are no terms and definitions that need to be defined in this document.

4 Common print files and their features

4.1 Dot print file The graphic ink is composed of circular ink dots, dull, sometimes separated dots are visible, the edges of the graphic are uneven, the oblique lines are wavy, and the ink dots are in the middle The phenomenon of ink squeezing with light edges and thick edges. The paper has impact indentations with a concave front and a raised back, often accompanied by ribbon marks. 4.2 Thermal print file The graphic ink is composed of square ink dots, and the strokes are prone to show whiteness, the oblique lines are stepped, and the ink is smooth. When printing with thermal ribbon, the The text is shiny and melted; when printing on thermal paper, the coating on the paper surface will change color when heated, and the pictures and texts will easily fade. 4.3 Inkjet print files The graphic ink is composed of small ink dots. Some inkjet printing inks are soluble in water, and the edges often appear burr-like and smeared. The edges of the strokes often Accompanied by scattered ink dots, the dots are mostly in the form of FM dots, which are prone to scratches and contamination marks. Note. FM dots refer to the fact that the size of dots in a unit area does not change, and the density of dots reflects the depth of image and text tone. 4.4 Laser Printing Documents The graphic ink is formed by the accumulation of toner particles, which is shiny, and scattered toner particles are common in the blank area, and the dots are in the form of amplitude modulation dots. department The yellow tracking code can be seen in the color laser-printed documents. Note. Amplitude modulation dots means that the number of dots in a unit area remains unchanged, and the size of the dots reflects the depth of the tone of the image and text. ......

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