1 Scope
This document describes test equipment and procedures for measuring the light stability
of photographic prints when subjected to a filtered xenon-arc light source at specified
levels of illuminance (irradiance), temperature and relative humidity. It is applicable
to both colour and monochrome reflection prints, transparent films, or translucent
films. It is also applicable to photographic prints in general, photobooks, or prints
for backlit displays.
General indoor display conditions described herein are intended to simulate common
use conditions found in houses, apartments and other dwelling places where indirect
lighting due to filtering (through window glass) and shading is often the principal
illumination causing displayed photographs to fade.
Simulated in-window display conditions are intended to simulate terrestrial daylight
transmitted through standard architectural window glass (double glazing). A typical
example of such display can be found when images are displayed in store windows, facing
toward the outdoors, so that they can be viewed by people outside of the store[5][6].
NOTE It is recognized that in some instances, physical degradation such as support embrittlement, image layer cracking, or delamination of an image layer from its support, rather than the stability of the image itself, will determine the useful life of a print material.
General guidance is given in ISO 18937‑1.