In literary descriptions, “coal” is frequently used to evoke an inky, impenetrable blackness that suggests mystery and intensity. Authors employ the term in phrases like “coal-black brows” [1] and “a pair of coal black eyes” [2] to create vivid, stark images of darkness in human features, imbuing characters with a brooding allure. Similarly, natural elements are rendered in this deep hue, as in the description of stems being “coal-black” [3], while similes such as “as dark as a coal-hole” [4] further reinforce the idea of an almost tangible, profound darkness. Through such usage, coal becomes a powerful visual metaphor in literature, representing not just a color but a mood and atmosphere steeped in intensity.