As a hobby, I'm starting to do calligraphy. I've bought some paper online a few weeks ago (a Rhodia paper block). Today, I found out that when the block lays on a flat surface, I see two or three small "waves" in the paper which seem they are caused by humidity (you know when you wet a sheet of paper and where it is wet it shows some "waves", well, they are similar, but extended through the whole page and not as tall). If I detach a sheet from the block it shows the very same small waves (it's not completely flat).
I also own some other blocks, and I see the same problem (although much less noticeable) in all of them. I live in a naturally humid environment, that's why my first suspect for this is humidity.
Is there a way to store paper in such a way that avoids this strange effect? Moreover, is there a way to make the block return flat?
Thanks in advance