POSCA Brand Marking Pens to Mark Queen Bees
Model: PC-3M
The international queen-color code is:
White: 2021 (years ending in 1 and 6)
Yellow: 2022 (years ending in 2 and 7)
Red: 2023 (years ending in 3 and 8) (alternately Pink for better visibility)
Green: 2024 (years ending in 4 and 9) (alternately Light Green for better visibility)
Blue: 2025 (years ending in 5 and 0) (alternately Light Blue for better visibility)