Celestial blue frequently appears in literature as a symbol of purity, transcendence, and the natural world’s serene beauty. In poetry and descriptive prose it evokes the vast expanses of clear skies and placid seas—illustrated in lines that speak of the “deep celestial blue of the cloudless sky” ([1]) and seas dyed to celestial blue by the overarching sky ([2]). Authors also use it to characterize emotional states and ethereal qualities, as when a character’s soul is described as transforming into a “celestial blue” ([3]) or when a glance is imbued with an almost otherworldly charm ([4]). At the same time, celestial blue is employed in tangible depictions, coloring garments, porcelain, and other objects—from a jacket of celestial blue ([5]) to elegant breakfast services and snuff-bottles that bear the mark of this vivid tint ([6], [7]). Thus, its versatile use not only paints vivid visual images but also deepens the symbolic resonance of the scenes it colors.