CSS named colour

Dark Red

#8b0000

A CSS named colour: darkred is valid anywhere a colour is expected.

RGB: rgb(139 0 0)
HSL: 0°, 100%, 27%
OKLCh: 40.0% 0.164 29.2

Dark Red in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#8b0000`
RGB	`rgb(139 0 0)`
RGB legacy	`rgb(139, 0, 0)`
RGB percent	`rgb(54.51% 0% 0%)`
HSL	`hsl(0 100% 27.3%)`
HSL legacy	`hsl(0, 100%, 27.3%)`
HSV / HSB	`hsv(0, 100%, 54.5%)`
HWB	`hwb(0 0% 45.5%)`
Nearest name	`darkred`
CMYK	`cmyk(0%, 100%, 100%, 45.5%)`Naive conversion. Real print work needs an ICC profile.

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

OKLCh	`oklch(39.986% 0.16408 29.234)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(39.986% 0.14318 0.08013)`
CIE LCh	`lch(28.758% 66.926 39.753)`
CIE Lab	`lab(28.758% 51.453 42.798)`
Display P3	`color(display-p3 0.4982 0.0902 0.0551)`
Rec. 2020	`color(rec2020 0.3853 0.0803 0.019)`
srgb-linear	`color(srgb-linear 0.2582 0 0)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.1065 0.0549 0.005)`

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

GLSL vec3 — sRGB	`vec3(0.545, 0.0, 0.0)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.258, 0.0, 0.0)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.545, 0.0, 0.0, 1.0)`
GLSL vec4 — linear	`vec4(0.258, 0.0, 0.0, 1.0)`
GLSL ivec3	`ivec3(139, 0, 0)`
HLSL float3 — sRGB	`float3(0.545, 0.0, 0.0)`
HLSL float3 — linear	`float3(0.258, 0.0, 0.0)`
HLSL float4 — sRGB	`float4(0.545, 0.0, 0.0, 1.0)`
HLSL half4 — sRGB	`half4(0.545, 0.0, 0.0, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.545, 0.0, 0.0)`
WGSL vec4f — sRGB	`vec4f(0.545, 0.0, 0.0, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.258, 0.0, 0.0)`

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

Unity Color	`new Color(0.545f, 0.0f, 0.0f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(139, 0, 0, 255)`
Unreal FLinearColor	`FLinearColor(0.2582f, 0.0f, 0.0f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(139, 0, 0, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0.545, 0, 0, 1)`
Flutter Color	`Color(0xFF8B0000)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(139, 0, 0)`
SwiftUI Color	`Color(red: 0.545, green: 0, blue: 0)`
UIKit UIColor	`UIColor(red: 0.545, green: 0, blue: 0, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0x8B0000`
0x hex (ARGB)	`0xFF8B0000`
Array 0–1	`[0.545, 0, 0]`
Array 0–255	`[139, 0, 0]`
Decimal integer	`9109504`

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
Dark Red on white	10.01:1	AAA	Lc 91	Body text at any size
Dark Red on black	2.10:1	Fail	Lc 12	Not usable for text

Dark Red text on a white background

Dark Red text on a black background

White text on Dark Red

Black text on Dark Red

Tonal scale

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

50#fff0eb
100#ffe2db
200#ffcabf
300#ffa798
400#fd7e6d
500#dd5c4d
600#bd4336
700#9e2d23
800#831b13
900#6c0a06
950#460000

Tints and shades

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

Tint 1#a33d32
Tint 2#b86559
Tint 3#cc8b81
Tint 4#dfb1aa
Tint 5#f0d8d4
Shade 1#6c0000
Shade 2#4e0000
Shade 3#320000
Shade 4#190000
Shade 5#040000

Colours that work with Dark Red

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

#005461
#005b11
#27399e
#850045
#733300

Closest CSS names

darkredexact match
maroonΔEok 0.025
brownΔEok 0.082
firebrickΔEok 0.098
saddlebrownΔEok 0.102
siennaΔEok 0.141