About Indigo
Indigo, #4b0082, sits between blue and violet — Newton’s controversial seventh rainbow color, kept partly for mystical arithmetic. As a dye it has no rival in human history: every pair of jeans on Earth is indigo’s descendant.
History
Indigofera plants fed five thousand years of dyeing from the Indus Valley (the word means “from India”) through slave-worked plantations that shaped colonial economies, until BASF’s 1897 synthesis ended the crop and began the era of industrial denim. Levi’s rivets did the rest.
Psychology
Indigo carries blue’s depth with violet’s introspection — intuition, night skies and the “third eye” of chakra tradition. In interfaces it reads as premium-tech: deeper than corporate blue, calmer than purple.
In design
Indigo is the modern web’s favorite dark accent family (#4f46e5, #6366f1) — vivid on white, luminous on dark. CSS indigo #4b0082 itself is nearly a text-safe black-alternative (12.3:1 on white). Pair with amber for energy, pink for gradients, slate for depth.
In culture
Indigo children, indigo moods, mood indigo — the color of dusk and Duke Ellington. Japan’s aizome workwear made it the color of labor centuries before denim did it again.