National Nail Polish Day is observed annually on June 1, celebrating the beauty and innovation of nail polish. Launched in 2017 by the American nail polish brand essie, the day marks the beginning of meteorological summer and the nail-care season, encouraging people to experiment with vibrant nail colors. The holiday has historical roots, tracing back thousands of years when natural pigments were used for nail painting, evolving into modern nail polish inspired by automotive paint in 1916. Typical customs include painting nails, booking manicures or pedicures, hosting nail-painting parties, and sharing photos of manicured nails on social media with hashtags like #NationalNailPolishDay. The formulation of nail polish includes various ingredients such as polymers, dyes, and additives, allowing for a wide range of finishes.