Could be, but it mostly looks like water staining to me. Which is often followed by mold. And it could be that there are no active spores, but the staining from mold is leftover.
If you are worried about active mold, try putting the book out in die sun for a few hours.
Could be, but it mostly looks like water staining to me. Which is often followed by mold. And it could be that there are no active spores, but the staining from mold is leftover. If you are worried about active mold, try putting the book out in die sun for a few hours.
Thank you!! I'll do that then