It also seems to depend on the cel. Different 
studios will have slightly different inks they 
use for the black lines. I have two cels framed - 
one a cel of Clary from Violinist of Hameln and 
the other a cel of Keith from Psychic Force. They 
were framed identically and hung in places that 
had the same amounts of light. I recently took 
down the one of Keith because it began to fade. 
On the other hand, the one of Clary shows *zero* 
signs of fading AND it's been up for twice as 
long as the one of Keith.

A further example. . . Sadly, it seems Psychic 
Force cels are a bit more delicate than others in 
the area of black lines. A number of my Psychic 
Force cels which have seen *nothing* but a scan 
and my cel book are beginning to inexplicably 
fade in places. Not badly and not enough to 
devalue them, but enough that *I* see it. ;_;  It 
can't be the conditions the cels are in, since I 
keep them all together and have noted no other 
problems. So it has to be the ink.

And by the way - the way I watched for the fading 
was to take a *VERY* high resolution scan of each 
cel before I hung it up and every month or so, I 
would compare the scan to the cel. That way you 
have a visual record of the cel's original 
condition right in front of you. You don't have 
to try and rely on what you think you remember it 
looked like. I recommend this to *anyone* framing 
a cel! I was very happy to have the reference so 
I could catch the fading of my Keith cel before 
it was too late!! O_O;;;   And of course, now 
that it has faded some, I'm happy I have the scan 
at least. . . ~_~

(On a related topic. . . I was considering making 
a copy of the cel so I can hang the copy and not 
the original. But does anyone here know how one 
might make a *sketch* from a cel? This cel didn't 
come with a matching sketch - it's one of only 
two Psychic Force cels I own that don't have one.)

Many Sharp Smiles,
--Drac (who misses having Keith watching over
        her at the computer ;_;)