These sources examine the historical and cultural transformation of the color blue, tracing its journey from an overlooked hue in antiquity to a dominant symbol of nobility and divinity. While ancient Greek and Roman societies lacked a precise vocabulary for blue, the Middle Ages marked a turning point where it became synonymous with the Virgin Mary and royal heraldry. This shift was fueled by the use of highly expensive pigments like lapis lazuli, which made certain blues more valuable than gold. Beyond art, the texts discuss how technological advances in dyeing and the influence of the Protestant Reformation helped transition blue into a marker of morality and respectability. Ultimately, blue evolved into a modern favorite, representing everything from romantic melancholy to contemporary political and professional identities. The provided excerpts highlight a multidisciplinary interest in how the materiality of pigments reflects deeper societal values and aesthetic evolution.