What does "one-color fill" refer to in nail care?

One-color fill refers to a maintenance service that involves applying a single color to a previously enhanced nail. This process is commonly performed to refresh the appearance of nail enhancements, such as acrylics or gels, that have grown out or need touch-ups. During a one-color fill, the technician typically focuses on filling in the gap at the growth area while maintaining the overall look of the nail enhancement by applying a coat of the same color used previously. This service helps ensure the nails look neat and polished while prolonging the life of the nail enhancements.

In the context of the other choices, a repair process for a broken nail does not specifically describe the one-color fill service, as it focuses on fixing damage rather than maintenance. Likewise, applying multiple colors to a nail is contrary to the concept of a single color fill, which emphasizes uniformity rather than variety in color application. Finally, while nail art techniques may involve various methods, they do not relate directly to the singular purpose of a one-color fill, which is primarily about enhancing and maintaining the existing nail design.