Applied to @P04589@ compounds possessing a high efficiency for colouring with near-@UT07492@ radiation and a low efficiency for @B00681@ with @VT07496@ radiation, but a moderate efficiency for thermal fading at ambient temperature. These compounds are activated by unfiltered sunlight and deactivated under diffuse daylight conditions, therefore being suitable for sun-lens applications.
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 350 [Terms] [Paper]