Whenever you add a new specimen to your collection, the Tag needs
printing box is checked. Later when you use the
Print labels . . . command, those items that are checked will be included in the list
of labels to print. When the labels have been printed, the Tag needs
printing box has its check removed.
You re-include an item in the
list by simply checking the box again.
For more articles in the "The not so obvious . . ." series see
Index of "not so obvious" things you should know