Heian era
Wisteria & Indigo— 藤と藍
The soft lavender of wisteria blossoms against deep indigo.
#1C3D5A
blue · 2 palettes
Ai
藍
True indigo
About Ai
Ai (藍) is a deep, muted blue tone. Its hex value is #1C3D5A — that is
RGB 28, 61, 90, or HSL 208°, 53%, 23%.
True indigo.
It holds 11.3:1 contrast against white, so Ai works best for body text, headings, and UI labels. (On white it scores 11.3:1; on black 1.9:1.)
Across Sanzo Wada's 1933 Dictionary of Color Combinations, Ai appears in 2 combinations — most often paired with Fuji, Gofun and Ukon.
The story of Ai
Ai (藍) is indigo — the deep blue dyed from the leaves of Polygonum tinctorium (Japanese indigo plant) through a fermented vat dye process that takes months to set up and decades to master. By the Edo period, ai was the workhorse blue of the entire country: samurai under-armour, merchant work clothes, futon covers, noren shop curtains. Whole towns built their economy around ai dyeing.
The colour reads everyday Japanese in a way no other blue does — closer to denim than to ultramarine, closer to navy than to cobalt, with a slight green undertone and the textile-dye depth that synthetic blues never quite match. Modern usage: heritage food brands, craft-goods packaging, anywhere that wants to read as 'old Japan' without reading as 'tourist Japan.'
Working note: The textbook ai pairing is with kinari (unbleached cream) — the indigo-and-cream of Edo-period workwear. Reads instantly traditional + warm + grounded.
Colours that go with Ai
From a standard colour wheel, Ai anchors these four classic schemes. Each swatch is computed from its exact hue, so every hex is a real, usable pairing.
Complementary
#1C3D5A #5A391C
the hue directly opposite — the highest-contrast pairing, good for a single bold accent.
Analogous
#1C3D5A #1C5A58 #1C1E5A
the two neighbours on the wheel — a calm, cohesive scheme that feels effortless.
Triadic
#1C3D5A #5A1C3D #3D5A1C
two hues an even third of the wheel away — balanced and lively without clashing.
Split-complementary
#1C3D5A #5A1C1E #5A581C
the two colours either side of the complement — the contrast of a complement, softened.
How to use Ai
Ai is a deep, muted tone (HSL 208°, 53%, 23%), which makes it a grounding background or strong accent. For text it passes WCAG AA for body text against a light background (11.3:1) — safe for paragraphs, buttons and labels. When you do set type on it, use light lettering. Pair it with its complement (#5A391C) for a focal accent, or with its analogous neighbours (#1C5A58 and #1C1E5A) for a quieter, harmonious feel.
Palettes with Ai
Ai appears in 2 combinations from the archive. Each pairing reveals how the same color shifts character depending on its neighbours.
From the archive
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