How should nail polish be stored to maintain its quality?

Storing nail polish in a cool, dark place is essential for maintaining its quality over time. Light and heat can break down the chemicals in the polish, causing it to thicken, separate, or lose its intended coloration. A cool environment helps to slow down the evaporation of solvent and maintains the consistency of the polish. Keeping it away from direct sunlight protects it from UV exposure, which can lead to fading and degradation of the polish's formula.

Additionally, a dark place minimizes the risk of light-induced chemical reactions that can alter the polish's properties. For these reasons, this method of storage ensures that the nail polish remains effective, smooth, and vibrant for an extended period.