Black surfaces look dark because they absorb most of the visible light that falls on them.

The longer version

A dark coating swallows photons instead of returning them. Pigment molecules in the coating take the energy of visible wavelengths and turn it into tiny amounts of heat, so very little light escapes back toward the eye and the surface reads as near-absence of signal.

Black clothing feels hotter in sunshine for exactly that reason, and engineers chase the same idea with arrays of microscopic tubes that trap light by bouncing it inward repeatedly. Truly matte black also hides surface texture, since shading cues come from reflected light. Charcoal and soot achieve darkness through the same absorption.

Where this entry sits

These facts explore how light behaves and how human eyes turn it into the colors we see. Along the way you meet rainbows, prisms, mirrors, shadows, lasers, and optical tricks that fool our vision every day. The full list sits on the Color and Light page, where every entry is listed in order.

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More From Color and Light

Eight more entries

Sunlight contains all the colors of the visible spectrum blended together into white light.

Violet light has the shortest wavelength visible to humans, while red has the longest.

The sky looks blue because air molecules scatter short blue wavelengths more than long red ones.

Sunsets often look red because sunlight travels through more air, which scatters away the blue light.

Laser light differs from ordinary light because its waves are aligned and share a single wavelength.

The traditional spectrum is often listed as seven colors, including red, orange, yellow, green, blue, indigo, and violet.

Most people cannot distinguish indigo from blue or violet in an ordinary rainbow.

Color blindness most often involves difficulty telling red from green rather than seeing no color at all.

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