Hi, Fellow Shell Enthusiasts!

I think I might have goofed too.   I bought a white plastic chest
with drawers to store some of my shells.   However, I lined the
drawers with black poster board, to keep the light out.   The
shells are lying on separate sheets of bubble plastic, so there
is fair ventilation in the space.   The chest sits where it is room temperature and dry, as our humidifier is not working and probably won't be in the near future.

Did I make a mistake in using the poster board?

Thanks,
Linda