What is the primary ingredient in most nail polishes?

The primary ingredient in most nail polishes is nitrocellulose. This compound serves as the film-forming agent that creates a hard, shiny surface on the nails once the polish dries. Nitrocellulose is a cellulose derivative that provides durability and adherence to the nail plate, making it a suitable choice for cosmetic formulations like nail polish.

In addition to nitrocellulose, nail polishes may also contain a variety of other components that enhance their performance and aesthetic appeal, such as plasticizers, colorants, and solvents. However, the function of nitrocellulose in forming the base of these products is fundamental, as it significantly influences the texture, longevity, and overall finish of the polish applied to the nails.