What is the correct technique for mixing polish in the bottle?

The technique of rolling the bottle gently between the palms is the preferred method for mixing nail polish because it allows for an even distribution of the pigments and other components without introducing air bubbles. Shaking the bottle too vigorously, either side to side or up and down, can create air bubbles in the polish, which can affect its consistency and application. Additionally, bubbles can lead to an uneven finish when the polish is applied to the nails. Rolling the bottle provides a more controlled mixing process, ensuring that the polish remains smooth and ready for application. This gentle approach helps maintain the quality of the polish and enhances the overall service provided to clients.