This color system for marking and identifying queen honeybees is accepted
and recognized internationally by beekeepers:
White (or gray) is used for years ending in 1 or 6.
Yellow is used for years ending in 2 or 7.
Red is used for years ending in 3 or 8.
Green is used for years ending in 4 or 9.
Blue is used for years ending in 5 or 0.
I have coined a little phrase that I find useful to help recall the sequence
of years and colors:
What Year is on the Royal Girl's Back? for White, Yellow, Red, Green, Blue.
Does anyone have a Yellow or Red marked queen still working anywhere?