Many languages have fewer basic color words than English, sometimes grouping blue and green together.

The longer version

Languages build color vocabularies in a rough order, adding terms over centuries rather than all at once. If a language has only two basic terms, they cover dark-cool and light-warm; with three, red joins; later stages split green from blue, then add brown, purple, pink, orange, and gray.

So a language with a single term spanning blue and green is not describing a perceptual deficit; its speakers distinguish the hues perfectly well and simply label them differently. Researchers in the twentieth century surveyed dozens of languages and found the order remarkably consistent. Some languages group yellow with green, others attach gray to white.

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

Turquoise sits between blue and green on the spectrum and is named after a gemstone.

Gold and silver describe metallic surface appearances rather than one particular wavelength of light.

The color of a flame changes with temperature, shifting from red toward blue as it gets hotter.

Optical illusions trick the brain by exploiting the shortcuts it uses to interpret light and edges.

Afterimages appear when staring at a bright color fatigues the cone cells responding to that hue.

A gray square looks lighter on a black background than the same square on a white one.

Neon colors seem to glow because they reflect more light than ordinary dyes can.

Fluorescent materials absorb invisible ultraviolet light and re-emit it as visible color.

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