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Basic dataStandard ID: GB/T 18117-2025 (GB/T18117-2025)Description (Translated English): Photography - Processed photographic colour films and paper prints - Methods for measuring image stability Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G81 Classification of International Standard: 37.040.20 Word Count Estimation: 50,512 Date of Issue: 2025-08-01 Date of Implementation: 2026-02-01 Older Standard (superseded by this standard): GB/T 18117-2000 Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China GB/T 18117-2025: Photography - Processed photographic colour films and paper prints - Methods for measuring image stability---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18117-2025 ICS 37.040.20 CCSG81 National Standard of the People's Republic of China Replaces GB/T 18117-2000 Photographic processed photographic color film and paper Image stabilization test method (ISO 18909.2022, IDT) Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface III Introduction IV 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Test Method 2 4.1 Sensitometric Exposure 2 4.2 Processing 2 4.3 Density determination 3 4.4 Definition of density terms 3 4.5 Density value to be measured 3 4.6 Density measurement correction method for dmin changes 3 4.7 Calculation of Image Life Parameters 6 4.8 Effects of Dye Fading and Dyeing on the Quality of Color Negative Image Printing 5 Dark stability test method 7 5.1 General Principles 7 5.2 Test conditions 8 5.3 Sample size 8 5.4 Test equipment and operation of free hanging specimens 9 5.5 Test equipment and operation of specimens sealed in moisture-barrier bags 9 5.6 Handling and packaging of samples in moisture-barrier bags 9 5.7 Aging conditions for specimens sealed in moisture-barrier bags 9 5.8 Calculation of Dark Stability 9 6 Light stability test method 9 6.1 General 9 6.2 Sample size 10 6.3 Irradiance measurement and normalization of test results 10 6.4 Backing of specimens during irradiation testing 10 6.5 Standard window glass specifications 10 6.6 High-intensity filtered xenon arc ID65 light source (50klx~100klx) for simulating indoor indirect sunlight through window glass 6.7 Glass-filtered fluorescent interior lighting - cool white fluorescent lamps (80klx or less) 12 6.8 Incandescent tungsten lamp indoor illuminance 30klx - CIE illuminant A spectral distribution 14 6.9 Simulated outdoor sunlight (xenon arc lamp) 100klx-ClE-D65 spectral distribution 15 6.10 Intermittent halogen lamp slide projection 1000klx 15 6.11 Calculation of photostability 16 7 Test Report 16 7.1 General Principles 16 7.2 Dark stability test 18 7.3 Light stability test 18 Appendix A (Informative) An interpolation method for step wedge exposure 20 Appendix B (Informative) Reflective Photo Power Formula dmin Correction Method 21 B.1 Overview 21 B.2 Background 21 B.3 Basic formula representing the relationship between Ddye, ddye, and dmin 21 B.4 Comparison of the accuracy of full dmin correction, 1/2 dmin correction, and power formula dmin correction 22 B.5 Ddye Calculation Principles 24 B.6 Notes on n 25 Appendix C (Informative) Arrhenius Calculation of Dark Stability 26 C.1 Fading curve diagram 26 C.2 Arrhenius diagram 27 C.3 Computerization of the Arrhenius method 28 Appendix D (Informative) Importance of Initial Density on Dye Fading and Color Balance Changes in Light Stability Tests 29 Appendix E (Informative) "Encapsulation Effect" When Photos are Framed and Covered with Glass or Plastic Sheets in Light Stability Tests 31 Appendix F (Informative) Data Processing of Color Image Photostability 33 F.1 Overview 33 F.2 Data processing procedures 33 F.3 Results 38 Reference 39 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 18117-2000 “Test method for stability of photographic image of processed photographic color film and paper” Compared with GB/T 18117-2000, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Changed the names of the Wratten filters in Table 1 and added the Fuji type (see 4.1, 3.1 of the.2000 edition); b) Added relevant content that processing liquids and processing procedures will have a significant impact on the dark retention and light stability of photographic color materials Capacity (see 4.2); c) Added "Explanation of the density measurement method for translucent materials" and added the reflective photographic material replacement in the dark stability test in Table 2. Substitution method (see 4.6.1); d) Added “Calculation of image life parameters” (see 4.7); e) Added “The effects of dye fading and staining on the quality of color negative film printing” (see 4.8); f) Added relevant content on “Dark Stability Test Method” (see Chapter 5, Chapter 4 of the.2000 edition); g) Added test equipment and operation (see 6.6, 5.6 of the.2000 edition); h) Changed the illumination of cool white fluorescent lamps, added the introduction of two types of cool white fluorescent lamps, and changed the surface temperature of the specimen (see 6.7, 5.7 of the.2000 edition); i) The specimen surface temperature has been changed (see 6.8, 5.8 of the.2000 edition); j) The operating temperature has been changed (see 6.10, 5.10 of the.2000 edition); k) Added "General principles for test reporting" and deleted the image life parameter (see 7.1, 6.1 of the.2000 edition). This document is equivalent to ISO 18909.2022 "Photographic processed photographic colour films and papers - Test methods for photographic image stability" Test Methods". Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Photosensitive Materials (SAC/TC102). This document was drafted by. Lucky Film Co., Ltd., Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, and Shantou Lucky Film Co., Ltd. The main drafters of this document are. Li Xiaojing, Liu Qian, Xing Yanhong, Xuan Peng, Guo Jianguo, Zhou Shuyun, Sun Chenghua, Li Yunfei, and Chen Xiaoyuan. The previous versions of this document and the documents it replaces are as follows. ---First published in.2000 as GB/T 18117-2000; ---This is the first revision.introductionThis document is divided into two parts. Part I covers methods and procedures for predicting the long-term dark storage stability of photographic color images; Part II This section covers the determination of photographic image stability at specific temperatures and relative humidity and under specific intensity and spectral distribution of light. Methods and procedures for testing. Most continuous-tone photographs today are made with photographic color materials, and the time it takes to store these photographs can range from a few days to several hundred years. The final use of a photograph is often determined by the initial For many users, it is important to understand the lifespan of color photos, especially the stability that often varies with the For museums, archives and other institutions responsible for preserving color photographic materials, if you want to keep the images Long-term stability requires an understanding of the various storage and display conditions of color photographs. Most modern color photographs are made by dispersing yellow, magenta, and cyan organic dyes in a transparent binder layer, which is then coated on a transparent or Photographic color dye images will fade during storage and display due to the fading of the three color dyes. In addition, yellowing (or occasionally other colors) stains (called staining) may form and Physical degradation such as embrittlement and cracking of the support and image layer may occur. The rate of image fading and staining can vary widely, depending primarily on the The quality of chemical processing is another important factor, depending on the inherent stability of photographic color materials and their storage and display conditions. In addition, post-processing such as applying varnish, laminating plastic film and retouching coloring will also affect the stability of colored materials. The two main factors that influence the storage behavior (i.e. dark stability) are the temperature and relative humidity of the air that comes into contact with the photograph. Especially when combined with high relative humidity, chemical reactions will be accelerated, leading to the degradation of one or more image dyes. Other potential causes of image degradation include atmospheric pollutants (such as oxidizing and reducing gases), microorganisms and insects. The main factors affecting the stability of color photos when displayed indoors or outdoors are lighting intensity, lighting time, lighting spectrum distribution and surrounding Environmental conditions (however, slower dark fading and staining reactions still occur normally during display and need to be included in the total change in image quality). Ultraviolet (UV) radiation is particularly harmful to certain types of color photographs, causing rapid fading and degradation of plastic layers such as coatings. Polyethylene pigment layer on plastic (RC) paper base. In actual applications, the temperature, relative humidity, lighting intensity, and duration of storage and display of color photos are different. It is impossible to accurately predict the useful life of a type of photographic material unless the specific storage and display conditions are known in advance. In addition, acceptable variations The amount varies from person to person and is affected by the type of picture, image tone and color quality. Although a large number of amateur and professional color photographs suffering from varying degrees of fading or staining have been examined, For this reason, this document does not specify acceptable limits for fading and color balance changes. Generally speaking, the acceptable range for changes in overall image density is twice that for changes in color balance. Therefore, this document uses Different judgment criteria are used as examples to predict changes in image density and color balance. Pictorial tests can help assess the visual changes that occur during light and dark stability tests but are not included in this document because there is no A single frame can represent the various different scenes actually encountered in photography. On dark storage at normal room temperature, images on most modern color films and papers fade and stain very slowly, and cannot be easily The dark storage stability of samples is evaluated by measuring their changes over time, because in this case, obtaining meaningful stability data requires However, by carrying out accelerated aging tests at high temperatures, it is possible to evaluate in a relatively short period of time the effects of aging that may be very severe at low and medium temperatures. Fading and staining behavior that occurs over a long period of time. The effect of relative humidity can also be evaluated by conducting high temperature tests at two or more humidity levels. Similarly, information on the photostability of color photographs can be obtained through accelerated photostability testing. This requires a special instrument equipped with a high-illumination light source. A test device in which test specimens are exposed for days, weeks, months, or even years to produce the desired amount of image fading (or staining). During the test, it is necessary to control the temperature and moisture content of the sample and select the light source type so that the data obtained are consistent with those obtained under normal use conditions. The data obtained have satisfactory correlation. Accelerated photostability test for predicting the photostability behavior of photographic color images under normal display conditions, where reciprocity laws may fail When applied to light-induced color image fading and staining, reciprocity failure refers to the phenomenon that when the dye is exposed to high-intensity light and low-intensity light, the color of the dye will be distorted. When irradiating with illuminance light, even if the total exposure is kept constant by appropriate adjustment [see reference [6], total exposure = (illuminance × time)], Many dyes do not fade or stain to the same extent. Under accelerated conditions, dyes may fade or stain to a greater or lesser extent, depending on the The degradation of the dye depends on the photochemical reactions involved, the manner in which the dye is dispersed, the nature of the bonding material, and various other factors. In the experiment, the oxygen supply from the surrounding atmosphere to the emulsion layer on the photograph containing the image may be limited (dry gelatin is an excellent Oxygen barrier materials), which may change the rate of dye fading relative to that which occurs under normal display conditions. The temperature and humidity content of the specimen will also affect In addition, photofading is also affected by the irradiation mode (continuous or intermittent) and the light/dark cycle rate. For these reasons, the test should be carried out only under conditions similar to those used in the accelerated test or under conditions that are close to those used in the actual use. Long-term changes in image density, color balance, and staining levels can only be reasonably estimated when good correlation has been confirmed between the images. In order to determine the effectiveness of the test method for evaluating the dark stability and light stability of products, the following different types of photographic color glue were selected Test and verify the following. a) Color negative films with oil-soluble couplers; b) Color negative motion picture preprint negatives with oil-soluble couplers; c) Color reversal films with oil-soluble couplers; d) color reversal films with Fischer-type couplers; e) Color reversal film with coupler in the developer solution; f) Silver dye bleached films and photographs; g) color photographs with oil-soluble couplers; h) Color motion picture films with oil-soluble couplers; i) color dye absorption (dye transfer) type photographs; j) Integral color instant film with dye developer; k) Peel-off color Polaroid film with dye developer; l) One-piece color instant film with dye release. Extensive testing of these materials has shown that the methods and procedures in this document can be used to obtain specific color photographic products. They can also be used to compare the stability of different color photo products and to evaluate the impact of The accuracy of predictions based on such accelerated aging tests will largely Depends on actual storage or display conditions. It is also important to remember that changes in measured density (both during and after the test) caused by the test conditions, although also including film or The base material and various auxiliary layers of photographic papers vary, but for most materials the changes mainly occur in the dye imaging layer. Prediction of photographic color image stability in dark storage, based on the Arrhenius method described by Bard et al. (see references [7][8]) and Early references by Arrhenius, Steiger et al. (see references [9][10][11]). Although this method is derived from the widely known Although many theoretical rules of chemistry are known and proven, their validity in predicting changes in photographic images depends on empirical verification. The image fading and staining data of multi-color photographic color products obtained in accelerated and non-accelerated dark aging tests are in good agreement with Arrhenius relationship, but some other types of products do not meet this requirement. NOTE. For example, one-piece color instant film materials often exhibit atypical dyeing at high temperatures; processing certain materials at temperatures above 80°C and relative humidity of 60% can Some color-forming photographic color materials can cause loss of high-boiling-point solvents and abnormal image degradation; and silver dyes bleach the image dye at very high temperatures. In combination with high relative humidity, it will depolymerize, resulting in abnormal changes in color balance and saturation (see reference [12]). Photographic materials tend to undergo particularly dramatic changes in physical properties when relative humidity exceeds 60% (especially at high temperatures in accelerated testing). change. The light stability test method in this document is based on the concept that under typical viewing and display conditions, increasing the light intensity without changing the light The photochemical reaction increases in the same proportion when the source spectral distribution or the ambient temperature and relative humidity are changed without producing any undesirable side effects. effect. However, due to the reciprocity failure discussed in this introduction, this assumption does not always hold. Qualitative test methods are only valid under specified accelerated test conditions and may still not reliably predict the performance of a product under normal conditions. Performance during long-term display. Transflective films designed for viewing by reflected light or transmitted light (or a combination of reflected and transmitted light) should be viewed as transflective films or reflective films. Each condition of intended use needs to be reported. This document does not indicate which of several photostability tests is most important for any particular product. Photographic processed photographic color film and paper Image stabilization test method1 ScopeThis document specifies a test method for predicting the long-term dark storage stability of photographic color images and for determining the long-term dark storage stability of photographic color images at specified temperatures and relative humidity. Test method for color stability of such images after exposure to a certain light source. This document applies to photographic color images produced from conventional continuous-tone photographic materials, which are formed by dyes, including color-forming Dye, silver dye bleaching, dye transfer and dye diffusion transfer instant systems. This test is used to evaluate toner and liquid ink electrophotography, thermal Color printing systems such as dye transfer (sometimes called dye sublimation), inkjet printing, pigment-gelatin systems, offset printing, gravure printing, and related color imaging systems The stability of color images has not been verified. If these reflective photo materials (including silver halide color types) are digital photos, refer to Dark stability tests are conducted in accordance with ISO 18936, ISO 18941, ISO 18946 and ISO 18949, and with reference to ISO 18937 (all parts). Perform photostability testing. This document does not include test procedures for the physical stability of imaging, paper-based, or binding materials. However, it is recognized that in some cases, Physical degradation (such as paper embrittlement, emulsion cracking, or image layer peeling from its paper base) is more important in determining the stability of a color image than the stability of the image itself. The lifespan of film or photographs.2 Normative referencesThe contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for refere......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 18117-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 18117-2025_English as soon as possible, and keep you informed of the progress. 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