Functional Coloring are materials that have a variety of functional physical properties, not just the coloring properties of conventional dyes and organic pigments.

It exhibits unique physical properties, such as sharply absorbing only specific wavelengths, and changing color when exposed to a small amount of external energy such as light, heat, electric field, or pressure.

Due to their properties, these dyes are attracting attention and being used as key materials for functionalization in a wide range of fields, including display devices in the electronic information field, energy conversion materials, and recording materials.