Scientists Recreate Ancient 'Sea Silk' and Uncover Its Color Secret

Researchers at the Pohang University of Science & Technology (POSTECH) have successfully recreated the legendary "sea silk," a rare golden fabric historically reserved for royalty and religious relics. By utilizing byssus threads from the pen shell (Atrina pectinata)—a species cultivated in Korean waters—the team has developed a sustainable alternative to the endangered Mediterranean clam (Pinna nobilis) that originally produced this prized material.

The study, published in Advanced Materials, provides a breakthrough in understanding why sea silk maintains its brilliant luster for centuries. Unlike conventional textiles that rely on chemical dyes, the golden hue of sea silk is a result of structural coloration. The researchers identified microscopic, layered protein structures called "photonin" that manipulate and reflect light. Because this color is an inherent physical property of the fiber's architecture rather than a surface pigment, it is remarkably resistant to fading over time.

This discovery carries significant implications for both material science and cultural preservation. By identifying a viable, sustainable source for this ancient fiber, researchers have provided a path to revive a lost textile art without further endangering the protected Mediterranean species. Furthermore, the insight into structural coloration offers potential applications in the development of long-lasting, eco-friendly dyes and advanced materials that mimic the durability and aesthetic brilliance of natural biological structures.