#003366Prussian Blue (#003366) is a very dark, soft blue with an OKLCH hue of 254°, lightness 0.32 and chroma 0.103. It sits on the cool side of the color wheel. In practice it behaves as a grounding tone — suited to text, outlines, and shadowed surfaces.
| HEX | #003366 |
|---|---|
| RGB | rgb(0, 51, 102) |
| HSL | hsl(210, 100%, 20%) |
| HSV | hsv(210, 100%, 40%) |
| CMYK | cmyk(100%, 50%, 0%, 60%) |
| CIE Lab | lab(21.3 6.8 -34.2) |
| OKLCH | oklch(0.323 0.103 254) |
Under warm 2700K interior light Prussian Blue shifts subtly: leans toward purple; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 1.2), so it is a lighting-stable choice.
#0d3260 — ΔE 1.2, shifts subtly: leans toward purple#073464 — ΔE 0.7, is virtually unchanged#003366 — ΔE 0.0, is virtually unchanged#003367 — ΔE 0.2, is virtually unchangedTest Prussian Blue in the color lighting simulator — sweep it through daylight, warm 2700K light, 4000K LED, and shade alongside the rest of your palette.
Against white it measures 12.61:1 and against black 1.67:1, so white text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid black text on this color entirely.
One color explored: close hues with real lightness and chroma structure, so the palette is the anchor through value rather than a set of colors.
#8faed3 · #6588b2 · #3c6391 · #003366 · #001f45 · #00051a
The anchor's neighbours on the wheel — everything shares an undertone, so the chord carries color without anything having to be muted to get along.
#065d73 · #00496b · #003366 · #141e52 · #160b3c · #110024
The mid-gap pairing — sage and mustard, terracotta and olive. A foil rotated 40–65° toward warm or cool: too far to be kin, too near to argue, carried by temperature and a deliberate value offset.
#ae9dc2 · #648ab8 · #785999 · #554764 · #003366 · #001b3d
One deliberately opposed voice — a single restrained counterpoint across the wheel, or temperature against temperature where the anchor is too muted to carry a loud opposite.
#e7b572 · #5b728d · #455262 · #003366 · #041932 · #00030f
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#f8f1e8 · #aeb8c4 · #837e78 · #424c59 · #003366 · #221d15
This color as a ground rather than a subject — its own restraint held across a narrow value band, carrying one saturated voice from the opposite temperature.
#f8f0e7 · #d4cbbf · #aca195 · #3c301f · #1a0e01 · #003366
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#d3dab5 · #f67031 · #7a71b2 · #5e3b42 · #003366 · #0d0628
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#ffefdc · #e4a68c · #898230 · #713a20 · #003366 · #221e00
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffedee · #e6a1a7 · #658c4b · #375521 · #003366 · #321216
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#ffebf6 · #dda2c4 · #a37530 · #035a3e · #003366 · #2c1900
#2A5180 · #4E719B · #7291B6 · #98B2D1 · #C0D4ED
#002B59 · #00234B · #001B3E · #001432 · #000D26
#11345C · #1D3551 · #263546
As a deep tone it works for grounding elements — text, outlines, and shadowed surfaces — rather than open fields. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.