The word "darkle" has appeared in literature as a richly evocative term, often used to convey a process of darkening mingled with a sense of transformation or intensity. In Byron's "Don Juan," for instance, "darkle" is used to describe the swelling of a character's blue-veined brow, suggesting not only a physical change of color but also an emotional deepening or stirring beneath the surface [1]. Similarly, in Goethe's "Faust," the term is applied to the behavior of fire-flies whose winking and sparkling qualities merge with the surrounding gloom, creating a vivid image of nature in motion and evoking a dynamic interplay of light and shadow [2]. Together, these examples demonstrate how "darkle" enriches poetic imagery by bridging the realms of physical appearance and metaphorical transformation.