Wool’s unique protein structure exhibits a natural affinity for indigo dye, resulting in deep, rich coloration and exceptional colorfastness. The scaly surface of wool fibers provides ample microscopic anchors for indigo molecules to bind to, creating a more durable and lasting dye application compared to many other natural fibers.
The strong bond between wool and indigo offers significant advantages, including resistance to fading from sunlight and repeated washing. Historically, this characteristic made wool, dyed with indigo, a preferred material for workwear and military uniforms, where durability and color retention were essential. The resulting textiles were prized for their longevity and visual appeal.
