Secondly the color scheme is not a federal mandate punishable by five years in jail. We happen to use the yellow every year. Two reasons...... The yellow is the easiest to pick out among the five colors. The contrast..........specially when you put a blue dot on a dark queen with dark bees its just about worthless. The queens rarely last beyond 2 years (occasionally 3) any longer so the color sequence is less important than it used to be. Do you really mark them before their mating flights?
Hive tool now back in holster.