Marking a queen helps you to locate her so that you can safely transfer resources to other hives. You can also confirm that she has not been replaced. This tube holds the queen in place while you mark her with a marking pen on the thorax. Place the queen in the tube and gently confine her against the plastic screen with the sponge plunger. Once she is confined against the plastic screen, gently mark her thorax with a queen marking pen. The color indicates the year a queen is introduced into a hive. This is a safe, efficient marking method.
There is a purpose to the color used to mark a queen! While you can purchase whatever color you wish, beekeepers use the following colors to track the age of their queens.