
Curled Photographs
Hello. I have 5 early 20th century photographs had which have recently developed an intense curve. When I first purchased them they had a slight curve, but when I checked on them a few weeks ago the curve had grew.
I understand that flat photographs are best for storage and for scanning. I have tried, by many means, to get these photos flat. I have used a humidification chamber for upwards of 3 hours, and then pressed them under heavy weights for a week, yet their curve still grew back after seconds of not being under weights.
What can I do? At least, what can I do to stop this curl from increasing again?