18-color color matching

Quick answer：

18-color color matching typically refers to a set of 18 different colors that are designed to work well together in a coordinated fashion. This concept is often used in graphic design, fashion, and interior design to create visually appealing and harmonious color schemes. In graphic design, for example, an 18-color palette might be chosen to ensure that a design is both rich and versatile, allowing for a wide range of applications while maintaining a cohesive look.