Linked from
The 15 pages that link to Photobleaching, each with the reason it gives.
Fluorescence spectroscopyRelated: It causes fluorescence signals to fade during illumination.
PhotodegradationBroader topic: It is a visible form of photodegradation in dyes and pigments.
Green fluorescent proteinRelated: Repeated illumination can fade GFP signals during imaging.
FluoresceinRelated: Prolonged excitation can dim fluorescein during imaging.