I have several panoramas, some as long as 60" that have been rolled up for many years. How can I go about uncurling them? I was thinking of placing it in a humid room until it could relax a bit and then carefully unroll them. If they seem to be flexible enough to straighten out, attach weights and hang it and then let the room lose the humidity. Then after the humidity has left the panorama, flatten between some acid free material. Thoughts?