I have recently taken over for an art teacher who left the school and left the artroom in quite a disarray. In my storage room, I have found TONS of paper that is shiney and white - kind of looks like thin posterboard and it's about 11x14. Not high gloss, but quite a sheen that makes it impossible to draw on with graphite or markers. Any idea what this is or what it's purpose is? I hate to waste so much paper, and I am sure I can come up with a use, but I'd love to know it's original intent. Thanks!