Steel Blue (RAL 5011)

RAL steel blue, a cool, austere dark blue verging on black

HEX#232C3F

RGBrgb(35, 44, 63)

HSLhsl(221, 29%, 19%)

HSVhsv(221, 44%, 25%)

CMYKcmyk(44%, 30%, 0%, 75%)

HEXA#232C3FFF

RGBArgba(35, 44, 63, 1)

HSLAhsla(221, 29%, 19%, 1)

OKLCHoklch(55.5%, 0.035, 262)

LCHlch(48.3%, 17, 256)

🎨 Color Palettes

Analogous2-3 adjacent hues (≤60°)

Triadic3 hues spaced 120° apart

Split ComplementaryMain color + colors adjacent to its complement

Complementary2 hues spaced 180° apart

Tetradic (Rectangle)4 hues forming a rectangle

MonochromaticSingle hue with varying saturation and lightness

♿ WCAG Contrast Colors

Learn More →

Aa14px Body

High Contrast Text

#ADB8D2Ratio 7:1AAA

Suitable for body text, headings, and primary content, ensuring readability for all users

Aa14px Body

Standard Text

#958CC0Ratio 4.5:1AA

Suitable for regular body content, meeting WCAG AA standards

Aa14px Body

Large Text / UI Components

#9261A8Ratio 3:1AA Large

Suitable for large text (≥18px bold or ≥24px), icons, UI component boundaries

Aa14px Body

Decorative / Dividers

#804759Ratio 2:1Fail

Suitable for decorative elements, dividers, non-essential text

📊 Color Scales

Online Color Picker → Gradient Generator →

Lightness VariationFixed hue and saturation, proportional lightness scaling 30%→100%

#0B0E14

#0E121A

#121721

#161B27

#1B2231

#1F2738

#222B3F

Saturation VariationFixed hue and lightness, proportional saturation scaling 40%→100%

#2B2E36

#292E38

#282D39

#272D3A

#252C3C

#242C3D

#222B3F

Lightness + Saturation Mixed VariationSimultaneous lightness and saturation proportional scaling

#0E0F11

#121417

#16181D

#191C24

#1E232F

#202737

#222B3F

Hue Fine-TuningFixed saturation and lightness, stepwise hue fine-tuning ±15°

#22323F

#22303F

#222E3F

#222B3F

#22293F

#22273F

#22243F

💡 Use Cases

🔫

Firearm Coatings

Surface treatment for small arms from Walther and Heckler & Koch—matte steel blue providing wear resistance, rust prevention, and tactical camouflage.

📻

Braun Appliances

Classic radios and razors designed by Dieter Rams—steel blue metal bodies defining what timeless good design should be.

⌚

Smartwatches

Titanium case coatings on Garmin or Apple Watch flagships—tough, skin-friendly, revealing military-grade texture in outdoor light.

✒️

Tactical Pens

EDC titanium alloy defense pens—steel blue anodized bodies serving dual purposes: emergency glass-breaking and everyday writing.

📜 Origin & History

RAL 5011 Steel Blue originates from the deep luster of steel surfaces after bluing treatment. In the late 19th century, German arsenals developed alkaline bluing to prevent firearm corrosion, creating a near-black deep blue layer of magnetite on gun surfaces.

This color was also one of the standard helmet finishes for the German Wehrmacht before WWII. In historical images, that rough, matte steel blue provided excellent concealment in trenches and ruins—an indelible visual scar of a heavy era.

Post-war, industrial design pioneers like Braun transferred steel blue from weapons to civilian products. On Braun's famous razors, radios, and calculators, this slightly textured deep blue metallic finish proclaimed a no-excess Prussian functionalism.

Today, steel blue has been redefined as the material aesthetic of premium dark finishes. On phone frames, watch cases, and fine writing instruments, this blue-toned black—only visible under light—is a secret code for discerning craftsmanship and brand status.

🧠 Color Psychology

Iron-BloodedRetaining the afterimage of the firearm era—cold and efficiently executing precise strikes, maintaining order without sentimentality.

Silently MartialAn unprovoked yet commanding peacetime presence—like a rifle resting on its rack, aggression restrained yet ever ready.

MatteA rough surface reflecting no useless glare—like metal seasoned by gunpowder smoke, no longer needing shine to prove existence.

StreamlinedBauhaus-style reduction—paring away all curves and ornament to reveal the leanest functional skeleton.

Stress-ResistantForged and tempered—possessing extraordinary resistance to stress, never yielding to external force or hardship.

Coldly LogicalExcluding all emotional factors in computation—like a CPU cooler, maintaining rationality under high load through low temperature.

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