Beekeepers often mark their queens with color. This is done with a special paint for queen marking.
Marked queens are more easily spotted in the hive.
Every year has a certain color that is used to mark the queens that emerged that year. Thanks to the color, beekeepers know how old is the queen.
Queens that are born in the years that end in:
🔵 0 and 5 are marked with blue paint,
⚪️ 1 and 6 with white,
🟡 2 and 7 yellow,
🔴 3 and 8 red,
🟢 4 and 9 green paint.