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GA/T 1956-2021: Forensic sciences - Specifications for examination of printed documents
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| GA/T 1956-2021 | English | 179 |
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Forensic sciences - Specifications for examination of printed documents
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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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