The queen is marked with non-toxic green paint to make her easy to find when examining the health of the hive. The color green signifies that she began her life in 2014. Wikipedia reports that "The term queen bee is typically used to refer to an adult, mated female that lives in a honey bee colony or hive; she is usually the mother of most, if not all, the bees in the hive. The queens are developed from larvae selected by worker bees and specially fed in order to become sexually mature. There is normally only one adult, mated queen in a hive, in which case the bees will usually follow and fiercely protect her." Please see en.wikipedia.org/wiki/Queen_bee#Reproduction_cycle
. Scrib Messenger, Apiarist Made at Columbia, Maryland, on May 16. 2014.