Colour reference

Zinc 400

#a1a1aa

RGB: rgb(161 161 170)
HSL: 240°, 5%, 65%
OKLCh: 71.2% 0.013 286.1

Zinc 400 in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#a1a1aa`
RGB	`rgb(161 161 170)`
RGB legacy	`rgb(161, 161, 170)`
RGB percent	`rgb(63.14% 63.14% 66.67%)`
HSL	`hsl(240 5% 64.9%)`
HSL legacy	`hsl(240, 5%, 64.9%)`
HSV / HSB	`hsv(240, 5.3%, 66.7%)`
HWB	`hwb(240 63.1% 33.3%)`
Nearest name	`darkgray (approx.)`
CMYK	`cmyk(5.3%, 5.3%, 0%, 33.3%)`Naive conversion. Real print work needs an ICC profile.

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

OKLCh	`oklch(71.181% 0.01294 286.066)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(71.181% 0.00358 -0.01243)`
CIE LCh	`lch(66.456% 4.865 285.676)`
CIE Lab	`lab(66.456% 1.314 -4.684)`
Display P3	`color(display-p3 0.6314 0.6314 0.6636)`
Rec. 2020	`color(rec2020 0.5934 0.5922 0.6263)`
srgb-linear	`color(srgb-linear 0.3564 0.3564 0.402)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.347 0.3597 0.4315)`

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

GLSL vec3 — sRGB	`vec3(0.631, 0.631, 0.667)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(0.356, 0.356, 0.402)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(0.631, 0.631, 0.667, 1.0)`
GLSL vec4 — linear	`vec4(0.356, 0.356, 0.402, 1.0)`
GLSL ivec3	`ivec3(161, 161, 170)`
HLSL float3 — sRGB	`float3(0.631, 0.631, 0.667)`
HLSL float3 — linear	`float3(0.356, 0.356, 0.402)`
HLSL float4 — sRGB	`float4(0.631, 0.631, 0.667, 1.0)`
HLSL half4 — sRGB	`half4(0.631, 0.631, 0.667, 1.0)`
WGSL vec3f — sRGB	`vec3f(0.631, 0.631, 0.667)`
WGSL vec4f — sRGB	`vec4f(0.631, 0.631, 0.667, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(0.356, 0.356, 0.402)`

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

Unity Color	`new Color(0.631f, 0.631f, 0.667f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(161, 161, 170, 255)`
Unreal FLinearColor	`FLinearColor(0.3564f, 0.3564f, 0.402f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(161, 161, 170, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(0.631, 0.631, 0.667, 1)`
Flutter Color	`Color(0xFFA1A1AA)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(161, 161, 170)`
SwiftUI Color	`Color(red: 0.631, green: 0.631, blue: 0.667)`
UIKit UIColor	`UIColor(red: 0.631, green: 0.631, blue: 0.667, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0xA1A1AA`
0x hex (ARGB)	`0xFFA1A1AA`
Array 0–1	`[0.631, 0.631, 0.667]`
Array 0–255	`[161, 161, 170]`
Decimal integer	`10592682`

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
Zinc 400 on white	2.56:1	Fail	Lc 50	Large headings only
Zinc 400 on black	8.19:1	AAA	Lc 52	Large headings only

Zinc 400 text on a white background

Zinc 400 text on a black background

White text on Zinc 400

Black text on Zinc 400

Tonal scale

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

50#f7f7fe
100#ededf4
200#dbdbe3
300#c5c5cd
400#a8a8b1
500#8a8a93
600#717179
700#5a5a61
800#47474e
900#37373d
950#1f1f23

Tints and shades

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

Tint 1#b0b0b8
Tint 2#bfbfc6
Tint 3#cfcfd4
Tint 4#dfdfe2
Tint 5#efeff0
Shade 1#7d7d84
Shade 2#5b5b61
Shade 3#3c3c3f
Shade 4#1e1e21
Shade 5#050506

Colours that work with Zinc 400

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

#a3a39a
#a9a09b
#9ba5a0
#9da3aa
#a5a0a8

Closest CSS names

darkgrayΔEok 0.026
rosybrownΔEok 0.060
cadetblueΔEok 0.085
lightslategrayΔEok 0.096
silverΔEok 0.097
darkseagreenΔEok 0.098