I think it might have the roots "auto" or "photo" in it. Thanks.
if it is a photo of a plant I think it is called: chlorophell
Are you talking about fading of the photo on paper, or overexposure?
'Photo deterioration' is a general term which applies to all degradation processes, which could include fading by exposure or oxidation.
A photograph may fade by exposure to air, moisture/water, light, or some chemicals.
Films that are not properly 'fixed' could experience image fading over time.
how about discolour or decolourise? Bleaching even?
(according to google)
I think he means the latter.
Separate names with a comma.