Colour reference

Prussian Blue

#023047

RGB: rgb(2 48 71)
HSL: 200°, 95%, 14%
OKLCh: 29.3% 0.062 237.0

Prussian Blue in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#023047`
RGB	`rgb(2 48 71)`
RGB legacy	`rgb(2, 48, 71)`
RGB percent	`rgb(0.78% 18.82% 27.84%)`
HSL	`hsl(200 94.5% 14.3%)`
HSL legacy	`hsl(200, 94.5%, 14.3%)`
HSV / HSB	`hsv(200, 97.2%, 27.8%)`
HWB	`hwb(200 0.8% 72.2%)`
Nearest name	`midnightblue (approx.)`
CMYK	`cmyk(97.2%, 32.4%, 0%, 72.2%)`Naive conversion. Real print work needs an ICC profile.

Perceptual & wide gamutModern CSS colour spaces for uniform scales and P3 displays.

OKLCh	`oklch(29.314% 0.06225 237.013)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(29.314% -0.03389 -0.05222)`
CIE LCh	`lch(17.983% 20.311 248.023)`
CIE Lab	`lab(17.983% -7.601 -18.835)`
Display P3	`color(display-p3 0.0679 0.1849 0.2706)`
Rec. 2020	`color(rec2020 0.0578 0.1204 0.2084)`
srgb-linear	`color(srgb-linear 0.0006 0.0296 0.063)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.0222 0.0258 0.0634)`

ShadersGLSL, HLSL and WGSL vectors in both encoded and linear form.

GLSL vec3 — sRGB	`vec3(0.008, 0.188, 0.278)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.001, 0.03, 0.063)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.008, 0.188, 0.278, 1.0)`
GLSL vec4 — linear	`vec4(0.001, 0.03, 0.063, 1.0)`
GLSL ivec3	`ivec3(2, 48, 71)`
HLSL float3 — sRGB	`float3(0.008, 0.188, 0.278)`
HLSL float3 — linear	`float3(0.001, 0.03, 0.063)`
HLSL float4 — sRGB	`float4(0.008, 0.188, 0.278, 1.0)`
HLSL half4 — sRGB	`half4(0.008, 0.188, 0.278, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.008, 0.188, 0.278)`
WGSL vec4f — sRGB	`vec4f(0.008, 0.188, 0.278, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.001, 0.03, 0.063)`

Engines & appsConstructors for Unity, Unreal, Godot, Flutter, SwiftUI and Android.

Unity Color	`new Color(0.008f, 0.188f, 0.278f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(2, 48, 71, 255)`
Unreal FLinearColor	`FLinearColor(0.0006f, 0.0296f, 0.063f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(2, 48, 71, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0.008, 0.188, 0.278, 1)`
Flutter Color	`Color(0xFF023047)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(2, 48, 71)`
SwiftUI Color	`Color(red: 0.008, green: 0.188, blue: 0.278)`
UIKit UIColor	`UIColor(red: 0.008, green: 0.188, blue: 0.278, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0x023047`
0x hex (ARGB)	`0xFF023047`
Array 0–1	`[0.008, 0.188, 0.278]`
Array 0–255	`[2, 48, 71]`
Decimal integer	`143431`

Contrast and accessibility

WCAG 2 ratios are what audits and legislation reference. APCA is shown alongside because WCAG 2 is known to misjudge mid-tone backgrounds, and it is the basis of the WCAG 3 draft.

Pairing	WCAG 2 ratio	Level	APCA	Suitable for
Prussian Blue on white	13.85:1	AAA	Lc 100	Body text at any size
Prussian Blue on black	1.52:1	Fail	Lc 0	Not usable for text

Prussian Blue text on a white background

Prussian Blue text on a black background

White text on Prussian Blue

Black text on Prussian Blue

Tonal scale

Hue held fixed while lightness walks OKLCh, ready to use as a design system ramp.

50#e1fcff
100#d0f3ff
200#bde2fb
300#a4cce6
400#85b0cb
500#6791ad
600#4f7791
700#3a6077
800#2a4c61
900#1d3c4e
950#082231

Tints and shades

Mixed perceptually toward white and black, so the steps feel evenly spaced.

Tint 1#2e4f63
Tint 2#556f81
Tint 3#7d919f
Tint 4#a7b5be
Tint 5#d2d9de
Shade 1#012336
Shade 2#011725
Shade 3#000c16
Shade 4#000408
Shade 5#000001

Colours that work with Prussian Blue

Complementary, triadic and analogous partners, rotated in OKLCh so they keep the same apparent brightness.

#432307
#441e2c
#2a3005
#00343c
#1e2a4b

Closest CSS names

midnightblueΔEok 0.100
darkslategrayΔEok 0.118
navyΔEok 0.137
darkblueΔEok 0.147
darkslateblueΔEok 0.155
indigoΔEok 0.169