RAL Classic color

RAL 5017 Traffic blue #063971

RAL 5017 Traffic blue is shown here as #063971, a widely published sRGB approximation of the printed swatch. It is a dark soft blue in the blue family. In OKLCH it sits at lightness 0.349, chroma 0.109 and hue 255.2°. The nearest CSS named color is darkslateblue (#483D8B), ΔE2000 11.1 away.

Relative luminance
0.0416
OKLCH L · C · h
0.349 · 0.109 · 255.2
Best text
White 11.46:1
Hue family
Blue
Inspect this color Check contrast

#063971 color codes

HEX
#063971
RGB
rgb(6, 57, 113)
HSL
hsl(211, 90%, 23%)
OKLCH
oklch(0.349 0.109 255.2)
OKLab
oklab(0.349 -0.028 -0.106)
CIELAB (D65)
L* 24.18, a* 7.92, b* -36.66
XYZ (D65)
X 4.52, Y 4.16, Z 16.18
CMYK (naive)
cmyk(95%, 50%, 0%, 56%)

CIELAB and XYZ use the D65 white point; CSS lab() uses D50, so paste the OKLCH or HEX value into stylesheets. CMYK here is a plain formula with no press profile.

RAL and RAL Classic are trademarks of RAL gGmbH, which this site is not affiliated with. The sRGB value is an approximation of the printed swatch; check a physical RAL color card before you specify a paint.

Legibility

Contrast: is #063971 accessible?

White text on it reaches 11.46:1, passing AAA. Black text fails at 1.83:1.

WCAG 2 gives the same ratio whichever color is the text; APCA does not, so its Lc changes sign and size with polarity.

Open the Contrast System

  • Black text on it

    1.83:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc +8

  • White text on it

    11.46:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc −99

  • As text on black

    1.83:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc 0

  • As text on white

    11.46:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc +95

Nearest versions that pass 4.5:1

  • For text on white

    #063971 11.46:1

    It already reaches 11.46:1 on white, so no change is needed.

  • For text on black

    #4676B3 4.50:1

    Lightening its OKLCH lightness from 0.35 to 0.56 reaches 4.50:1 on black, keeping the hue.

    Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #063971 live

Move lightness, chroma and hue in OKLCH, or drag on the map. The map is every lightness and chroma at the current hue: sRGB inside the solid area, Display P3 out to the dashed line.

The studio needs JavaScript.

Scale

Shades and tints of #063971

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #063971 sits at step 800.

  1. 50#EFF6FF
    White
    1.08
    Black
    19.29
  2. 100#DFEDFF
    White
    1.18
    Black
    17.69
  3. 200#BEDAFF
    White
    1.43
    Black
    14.66
  4. 300#91C1FF
    White
    1.86
    Black
    11.27
  5. 400#73A4E3
    White
    2.57
    Black
    8.14
  6. 500#5888C7
    White
    3.64
    Black
    5.76
  7. 600#4170AC
    White
    5.07
    Black
    4.13
  8. 700#2B5992
    White
    7.12
    Black
    2.94
  9. 800This color#063971
    White
    11.46
    Black
    1.83
  10. 900#012855
    White
    14.62
    Black
    1.43
  11. 950#001534
    White
    18.15
    Black
    1.15

Under each step, white and black text on it; a bold figure passes 4.5:1.

Gamut

How vivid #063971 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.116; #063971 uses 94% of it. Display P3, which many recent phones and laptops show, reaches 0.148 there: 28% more.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.109
sRGB edge
0.116
Display P3 edge
0.148
Rec. 2020 edge
0.278
Dominant wavelength
474 nm
Excitation purity
65%
Chromaticity
x 0.1817, y 0.1672
  • This color#063971
  • Most vivid in sRGB#003874
  • Most vivid in Display P3oklch(0.349 0.148 255.2)

On a screen without Display P3 the last tile shows the sRGB edge instead.

Use the wider color where screens show it
.accent {
  color: #063971;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0 0.2028 0.4991); }
}

Mixing

Mixing #063971

Each row is the same mix worked out in a different space, with the halfway color at its end. sRGB, which older CSS gradients use, can sag gray or dark in the middle; OKLab keeps the lightness steps even; OKLCH holds chroma and hue as it goes.

White #FFFFFF

  • sRGB50%#839CB8
  • OKLab50%#8099B8
  • OKLCH50%#8099B8

Black #000000

  • sRGB50%#031D39
  • OKLab50%#011027
  • OKLCH50%#011027

Its complement #503400

  • sRGB50%#2B3739
  • OKLab50%#343B44
  • OKLCH50%#004631
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #063971, white);
color: color-mix(in oklch, #063971 50%, white);

In use

#063971 in an interface

A button, a link, a heading, a focused field, an icon and a chart line in this color, on a light page and a dark one. Each check is a WCAG 2 contrast minimum: 1.4.3 for text, 1.4.11 for the rest.

Light page

  • Button labelText, 4.5:111.46:1 Passes
  • Link and body-size textText, 4.5:111.46:1 Passes
  • Large headingLarge text, 3:111.46:1 Passes
  • Icons, borders and focus ringsNon-text, 3:111.46:1 Passes

Dark page

  • Button labelText, 4.5:111.46:1 Passes
  • Link and body-size textText, 4.5:11.63:1 Fails
  • Large headingLarge text, 3:11.63:1 Fails
  • Icons, borders and focus ringsNon-text, 3:11.63:1 Fails

For text on this page, the nearest shade that passes is #4E7FBC 4.53:1

Color vision

How #063971 looks with color blindness

Achromatopsia changes it most, ΔE2000 20.5; deuteranopia changes it least, 1.3.

Simulated with Machado et al. (2009) at full severity, in linear light.

Simulate a whole page What each type sees

  • Protanopia

    No working red (long-wavelength) cones

    #193E73 ΔE2000 1.8

    Very close

    Reads as dark soft blue

  • Deuteranopia

    No working green (medium-wavelength) cones

    #003570 ΔE2000 1.3

    Very close

    Reads as dark soft blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #00474F ΔE2000 19.7

    Distinct

    Reads as dark muted teal

  • Achromatopsia

    No cone color vision; lightness only

    #393939 ΔE2000 20.5

    Distinct

    Reads as dark gray

Pairing check

Checked against its complement, #503400. Their lightness contrast is only 1.00:1, so where hue collapses, add a label, icon or pattern.

VisionThe pairΔE2000Verdict
Normal vision#063971 · #50340040.8Stays distinct
Protanopia#193E73 · #3E350041.7Stays distinct
Deuteranopia#003570 · #453C0244.7Stays distinct
Tritanopia#00474F · #582C2B43.1Stays distinct
Achromatopsia#393939 · #3A3A3A0.3Easily confused

Harmony

Color harmonies for #063971

Its complement is #503400, a dark muted brown, on the warm side of the wheel.

Hue rotations in OKLCH, mapped into sRGB by trimming chroma so hue and lightness stay put.

Open the Harmony Studio
  • Base#063971
  • Complement#503400

Complementary

Open in Harmony Studio
  • −30°#004154
  • Base#063971
  • +30°#372E6F

Analogous

Open in Harmony Studio
  • Base#063971
  • +120°#671A27
  • +240°#1F4500

Triadic

Open in Harmony Studio
  • Base#063971
  • +150°#622400
  • +210°#403C00

Split-complementary

Open in Harmony Studio

Code

Design tokens

Ready-to-paste tokens in six formats. Rename them to fit your system.

CSS custom property

:root {
  --color-ral-5017: #063971;
}

Tailwind config

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        'ral-5017': '#063971',
      },
    },
  },
};

Tailwind v4 theme

/* app.css — Tailwind CSS v4 */
@import "tailwindcss";

@theme {
  --color-ral-5017: oklch(0.349 0.109 255.2);
}

Design token (W3C DTCG)

{
  "color": {
    "ral-5017": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.0235, 0.2235, 0.4431],
        "hex": "#063971"
      },
      "$description": "RAL 5017 Traffic blue (approximate sRGB)"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let ral5017 = Color(.sRGB, red: 0.024, green: 0.224, blue: 0.443, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Ral5017 = Color(0xFF063971)
}

Matches

The nearest match in each system

The closest CSS name, Tailwind shade, RAL Classic paint and Crayola crayon by ΔE2000; under 2 is hard to tell apart side by side. RAL and Crayola values approximate physical colors.

Neighbors

The eight nearest colors on this site by ΔE2000, closest first. Under 2 is hard to tell apart side by side.

Tools

Open #063971 in the tools

Each opens over this page. More colors live in the Color Library, and every color page is listed on the hub.