GB/T 18117-2025 Photography—Processed photographic colour films and paper prints—Methods for measuring image stability

Scope

This document specifies the test methods for predicting the long-term dark storage stability of photographic color images, and the color stability test methods for such images after being exposed to specific light sources at specified temperatures and relative humidity.
This document applies to photographic color images produced by traditional continuous-tone photographic materials, which are formed by dyes, including color-forming dyes, silver dye bleaching, dye transfer, and dye diffusion transfer Polaroid systems. This test has not been validated in evaluating the stability of color images produced by ink powder and liquid ink electronic photography, thermal dye transfer (sometimes called dye sublimation), inkjet printing, pigment gelatin systems, offset printing, gravure printing, and related color imaging systems. If these reflective photographic materials (including silver halide color-forming types) are digital photos, refer to ISO 18936, ISO 18941, ISO 18946, and ISO 18949 for dark stability testing, and refer to ISO 18937 (all parts) for light stability testing.
This document does not include test procedures for the physical stability of images, paper-based or binding materials. However, it is recognized that in some cases, physical degradation (such as paper-based brittleness, emulsion layer cracking, or image layer peeling off from its paper base) can determine the lifespan of a color film or photograph more than the stability of the image itself.

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