Hi,
  How can I tell if a cel book's pages are acid-free if it
is not labeled on the cover? And usually, when I get a clearbook
/celbook, there's a yellow piece of paper serving as the 
in-betweener for a cel book's page. Is that paper acid-free 
and how do I tell? Is that piece of paper needed?
  Where can I get a piece of plastic to put on the back of the
cel as to prevent it from sticking to the cel book? But in using
this piece of plastic, the cel's paint will get stuck to the plastic
so that doesn't work very well either. Any other options?
  And do people usually store their cels by size or by series
or some other way?
  Thanks,
      Alice