Curing cyanoacrylate emits fumes which can deposit a white substance on nearby objects, especially if they have any oil on them. It can and has been used by law enforcement to reveal fingerprints. But it's not corrosive.
Yeah, it does leave a residue but I also saw bits of the photo layer degrading like a burnt out LCD pixel. Maybe it reacts but not corrode.
Oh, and Mistergreen came up with an idea in the DIY PAR meter thread that adding a purple filter gel to reject some of the green, while passing a higher proportion of photosynthetic red/blue, might give results closer to that of a real PAR meter.
Shouldn't it be a green gel to deflect green out? Like chlorophyll although magenta makes sense.