GA/T 1690-2019 English PDFGA/T 1690: Historical versions
Basic dataStandard 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 ForewordGA/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 method1 ScopeThis 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 Equipmentmicroscope.3 Inspection3.1 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 recordsThe 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 attentionWhen necessary, physical and chemical tests can be used to judge the formation of the seal. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GA/T 1690-2019_English be delivered?Answer: Upon your order, we will start to translate GA/T 1690-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GA/T 1690-2019_English with my colleagues?Answer: Yes. The purchased PDF of GA/T 1690-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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