A research team at Cornell University has developed the darkest textile ever recorded, marking a revolutionary breakthrough in material science and fabric engineering. Drawing inspiration from the naturally ultrablack plumage of the magnificent riflebird — a bird-of-paradise species known for its extreme light absorption — the scientists created a structurally enhanced black that far surpasses conventional dyes.
The riflebird’s feathers owe their intense darkness to melanin pigments combined with densely packed hierarchical barbules that trap light and prevent reflection. Inspired by this natural mechanism, the Responsive Apparel Design (RAD) Lab sought to replicate the phenomenon in textiles.
The team used polydopamine, a synthetic form of melanin, to dye white merino wool. Following this, the fabric underwent plasma etching, producing dense nanofibrils on the fibre surface. These microscopic spike-like structures mimic the riflebird’s light-trapping barbules, enabling the textile to absorb nearly all incoming light.
Measurements revealed an extraordinary result: the material reflects only 0.13% of light, making it the darkest fabric ever reported in scientific literature. Unlike other ultrablack materials, it retains its deep black appearance across a 120-degree viewing span, eliminating the angle-dependent shine seen in natural feathers.
Easy to manufacture, scalable, and compatible with natural fibres such as wool, silk, and cotton, the new ultrablack technology holds promising applications in solar thermal systems, telescopes, cameras, camouflage, and advanced apparel.
The research team has filed a patent through the Cornell Center for Technology Licensing (CTL) and aims to commercialize the innovation. Their findings are detailed in Nature Communications under the title “Ultrablack Wool Textiles Inspired by Hierarchical Avian Structure.”
The paper was authored by RAD Lab Director Larissa Shepherd along with doctoral researchers Hansadi Jayamaha and Kyuin Park.
