Literary authors have occasionally employed "bile" as a reference to a specific color or to evoke vivid hues, moving beyond its strictly medical or physical connotations. For example, Plato’s Timaeus alludes to the idea that different types of bile are distinguished by names relating to their colors, suggesting an intrinsic link between bile’s physical properties and its visual characterization [1]. Similarly, later texts describe bile’s practical role in color production—its mixture with sugar creating purple and red tints—and even portray its dramatic effect on appearance, such as when an overflow of bile transforms eyes to a green hue [2, 3]. These examples illustrate how bile has been used in literature not only as a bodily fluid but also as a metaphorical pigment to evoke specific visual and symbolic impressions.