* Canon cannot guarantee the longevity of prints; results may vary depending on printed image, drying time, display/storage conditions and environmental factors.
Criteria for estimation
The permanence presented above is estimated by using an accelerated dark storage tests designed for on silver-halide photos (ISO/FDIS18909). Samples are printed with an optical density of 1.0 (each black, cyan, magenta, yellow) and kept in a controlled environment of high temperature and 50% relative humidity. The test environment is designed to accelerate color fading. The rate of the decrease in the optical density and the rate of yellow discoloration of the paper are measured. Finally, the results are extrapolated to the length of time when a printed image is kept in an environment of 23° C 50% R.H.
Criteria for estimation of print longevity shown above
Estimates for image permanence are made using the Wilhelm Imaging Research, Inc. endpoint criteria:
Accumulated illuminance causes a monochromatic/reflective optical density loss of 20-35% (figures set respectively for each color, starting density of 1.0).
Accumulated illuminance causes a difference in color balance of yellow, magenta and cyan (each component in composite black) of 12-18%.