GA/T 1690: Evolution and historical versions
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(Forensic Science Seal Inspection Part 1: Microscopic Inspection Method)
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GA/T 1690-2019
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| GA/T 1690.1-2019 | English | 139 |
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Forensic sciences--Examination methods for seal stamps -- Part 1: Microscopy
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GA/T 1690.1-2019
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Basic data | Standard ID | GA/T 1690-2019 (GA/T1690-2019) | | Description (Translated English) | (Forensic Science Seal Inspection Part 1: Microscopic Inspection Method) | | Sector / Industry | Public Security (Police) Industry Standard (Recommended) | | Classification of Chinese Standard | A92 | | Date of Issue | 2019-10-14 | | Date of Implementation | 2019-12-01 | | Issuing agency(ies) | Ministry of Public Security | GA/T 1690.1-2019: Forensic sciences--Examination methods for seal stamps -- Part 1: Microscopy---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--Examination methods for seal stamps - Part 1.Microscopy
ICS 13.310
A92
Public Safety Industry Standards of the People's Republic of China
Forensic Science Seal Seal Test
Part 1.Microscopic inspection method
Part 1.Microscopy
Published on October 14,.2019
2019-12-01 Implementation
Issued by the Ministry of Public Security of the People's Republic of China
Foreword
GA/T 1690 "Forensic Science Seal Seal Test" is divided into 6 parts.
---Part 1.Microscopic inspection method;
---Part 2.Coincidence comparison method;
---Part 3.Detailed feature comparison method;
---Part 4.Measurement comparison method;
---Part 5.Splicing comparison method;
---Part 6.Line drawing comparison method.
This part is part 1 of GA/T 1690.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part is proposed by the National Criminal Technology Standardization Technical Committee Document Inspection Sub-Technical Committee (SAC/TC179/SC10) and
Be in charge.
This section was drafted by. Tianjin Public Security Bureau, Physical Evidence Appraisal Center of the Ministry of Public Security, Daqing Public Security Bureau.
Drafters of this section. Yu Jianmin, Gao Yuan, Wang Xiaoguang, Jiang Zhongjiao, Hou Jianzhong, Zhao Yuanxiang.
Forensic Science Seal Seal Test
Part 1.Microscopic inspection method
1 Scope
This part of GA/T 1690 stipulates the method specification for inspection of seals and seals by microscopic examination in the field of forensic science.
This section applies to the inspection of seals and seals in the field of forensic science.
2 Equipment
microscope.
3 Inspection
3.1 Direct observation
Observe the characteristics of inspection materials and sample seals directly under natural light. Focus on observing the clarity, gloss, layering and stroke edges of the printed text
Morphology, ink squeeze phenomenon and ink (mud) bleeding traces, etc.
3.2 Microscopic examination
Under the appropriate magnification and light intensity of the microscope, the following inspections are performed on the inspection materials and sample prints.
a) Judgment on the formation method.
1) The seal is formed by the characteristics of the seal. the seal is monochromatic (some anti-counterfeit seals are multi-color), and the imprint is natural and dark.
Oil (mud) penetrates the inside of paper fibers, and some of the printed text and edges have oil diffusion phenomenon. Pay attention to the combination during analysis
Factors such as seal material and inking method, storage and use conditions.
2) The printed text is the characteristic of printing. the printed text is composed of color toner particles, color ink dots, printing ink and other color materials,
The graphic features of the printed text conform to the characteristics of a certain type of printing.
b) Discovery of detailed features. the printed features such as whiteness, defects, wear, defects, secrets, attachments (dirty prints) can be observed.
4 Make inspection records
The microscopic enlarged picture of the printed text should be placed in the feature comparison table, and the same enlargement ratio should be maintained. If necessary, the details of the seal
Features or callouts.
5 matters needing attention
When necessary, physical and chemical tests can be used to judge the formation of the seal.
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