These display cases get a little dry in the winter due to the heating in the visitor centre. We have already improved the seals on the cases and swapped halogen lights for LEDs.  This next step is to hide as much used silica gel in the cases as possible. We are using second hand silica gel that has come from a damp environment in the expectation that it will slowly release moisture to the environment in the cases. The data loggers will soon tell us if we are right.