Hi all! I recently purchased a late 19th century lithography that has started to develop a strange rippling effect. Based on research, I believe I’ve narrowed down the issue to humidity (our room has hit a high of 70% recently).

If this is indeed the case, is there anything I can do to undo the damage? I’ve already purchased a dehumidifier with the aim of targeting between 50-60%.

Any advice would be greatly appreciated.

Thanks!!????