Well, who knows if the store used UV protective 
glass or not? Personally, I would guess that they 
are NOT. I know there's a store near me here in 
Boston that has two poor cels framed on it's 
wall. . . They, too, are like Lady Zatara said 
she had seen with the ones near her. But then the 
store here also has flourescant lighting (although
no sunlight could ever reach to where they're 
hanging) - and you have to remember that 
flourescant lighting is one of the **WORST** 
types of lighting under which to hang a cel. It 
will wreck the same damage that sunlight will, 
only I suspect, possibly faster than sunlight 
would.

I have my two cels framed under UV glass. I also 
keep them out of *any* sunlight (direct or 
reflected) and the only flourescant light I own 
is the one on my fishtank (which is under a 
closed hood and shines directly into the water). 
I have seen no trace line damage. (I have ultra 
close up scans of the cels, made when I bought 
them and I make sure to compare the scan to the 
cel at least once a month.) However, neither cel 
has been framed for any signifigant amount of 
time. (One has only been framed since the end of 
June.)

One thing I can say about the warping. . . I did 
a little test with my cel of Keith. I opened up 
the frame and sliced down the spacer to as narrow 
a size as would still provide sufficient support. 
What this did is, where formerly, the edges of 
the cel were sandwiched between the spacer and 
the mat, they are now completely free inside the 
frame. (The cel is held to the mat only by four 
acid-free corners and a single small piece of 
archival tape at the very top center to help 
prevent sagging.) This cleared up the warping 
which had started to reappear as it's decently 
warm and very humid today. If the warping stays 
cleared up, only a bit of time will tell.

But I still recommend keeping your cels in a cel 
book. I hear you, Lady Z on not needing to show 
them off for other people. I have no one else 
around who really appreciates cels either. . . 
But I've gotten so additcted to walking out in 
the morning and being greeted by my OP cel of 
Keith!! ^_^  ^_^   (*laugh*)

Many Sharp Smiles,
--Drac