cel damage types?

Tape damage from being stuck to background/sketch. I have two like that.

-Background Bleed

I had this on my Sailor Moon cel where the paints used were crappy...and bled through the back of the cel to the front...it suuuux!

um... When a sketch has a chunk missing out of it, but it's not actually a hole all the way through the paper, it's the top layer torn off but there is still a thin layer of paper left. uh. Sorry I didn't describe that in a shorter fashion.

Warped acetate. Someone been surfin' on my cel! #_#

Like another person said, a cel that is stuck to an unmatching background. Sometimes it can look nice but other time, you'll end up with a brown and orange rectangle pattern in the middle of a wonderful cel.