In literature, "indigo" is a multifaceted term that transcends its identity as merely a color. In works with a socio-political focus, such as in a well-known colonial drama, it emerges as a symbol of economic exploitation and labor, representing both the crop itself and its heavy burden on agrarian communities ([1], [2], [3]). Meanwhile, in adventure narratives and descriptive accounts, the word paints vivid scenes—whether evoking the mysterious depths of an "indigo sea" or lending a rich hue to fabrics and skies ([4], [5], [6]). Scientific and technical texts also employ the term to define a precise point in the visible spectrum, underscoring its cultural and aesthetic resonance ([7], [8]).