Super-black feathers can absorb virtually every photon of light

Male Birds of Paradise have patches of super-black plumage that absorb 99.95 percent of light. New research identified their feathers’ microscopic structures that make them look so very dark.

Is it true that there are no blue feathers? That they're really black and it's just the way light reflects off them that it appears that they're blue? - Quora

What color would black be under blue light? - Quora

If black is formed by full absorption of the light spectrum, then why is the space black in color? Does it have a light source for which to absorb? - Quora

Superblack' bird of paradise feathers absorb 99.95% of light, Science

What colours glow in black light and why is it only some colours

The Development of New Catalytic Pigments Based on SiO2 Amorphous Photonic Crystals via Adding of Dual-Functional Black TiO2-x Nanoparticles

If a substance absorbs blue light, then what is its color? - Quora

Feathers – News, Research and Analysis – The Conversation – page 1

Evolutionary tinkering with visual photoreception, Visual Neuroscience

Birds – information, recherche et analyse – La Conversation