Black Blue (RAL 5004)

RAL black blue, an ultra-dark blue verging on black

HEX#20212E

RGBrgb(32, 33, 46)

HSLhsl(236, 18%, 15%)

HSVhsv(236, 30%, 18%)

CMYKcmyk(30%, 28%, 0%, 82%)

HEXA#20212EFF

RGBArgba(32, 33, 46, 1)

HSLAhsla(236, 18%, 15%, 1)

OKLCHoklch(51.1%, 0.027, 282)

LCHlch(43.1%, 13, 265)

🎨 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

#A8AAC2Ratio 7:1AAA

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

Aa14px Body

Standard Text

#9181A7Ratio 4.5:1AA

Suitable for regular body content, meeting WCAG AA standards

Aa14px Body

Large Text / UI Components

#855E87Ratio 3:1AA Large

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

Aa14px Body

Decorative / Dividers

#69494BRatio 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%

#0A0B0F

#0D0D12

#111118

#15161E

#191A24

#1B1C27

#1F202D

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

#242429

#23232A

#22232A

#21222B

#21222C

#20212C

#1F202D

Lightness + Saturation Mixed VariationSimultaneous lightness and saturation proportional scaling

#0C0C0D

#0E0E10

#121316

#16171D

#1A1B23

#1C1D26

#1F202D

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

#1F242D

#1F232D

#1F212D

#1F202D

#201F2D

#211F2D

#221F2D

💡 Use Cases

🌑

Blackout Coatings

Interior of observatory domes and telescope tubes—eliminating any stray light that could interfere with exposures.

🎸

Industrial Rock

Visual baseline for Rammstein or Nine Inch Nails concerts—under black-blue lighting, producing screams like mechanical crushing.

🧥

Dark Avant-Garde

Draped jackets from dark artisan brands—revealing deep ink blue under strong flash—the ultimate aesthetic for connoisseurs.

📱

Dark Wallpapers

OLED phone native wallpapers—taking advantage of black-blue pixels' near-zero light emission for battery-saving, mysterious always-on display aesthetics.

📜 Origin & History

RAL 5004 Black Blue is one of the colors closest to the abyss in the RAL palette. It captures the phantom afterimage the retina perceives in darkness—the moment before the eyes adjust, on a starless, moonless night in a light-pollution-free wilderness.

In the set design of German Expressionist films like The Cabinet of Dr. Caligari, similar extremely dark blues were used for distorted street backgrounds. Richer than pure black, they conveyed dreamlike oppression and the psychoanalytic realm of the subconscious.

During the Cold War, nuclear submarines operating under the Arctic ice began using this deep finish. In the dim waters hundreds of meters below, black blue offered perfect optical camouflage—the color of silent, underwater superpower rivalry and absolute secrecy.

Contemporary fashion regards RAL 5004 as the superior alternative to black. In Yohji Yamamoto and Rick Owens' deconstructed silhouettes, this extremely dark blue still reveals structural lines at night—a darkness that requires close proximity to decode.

🧠 Color Psychology

ClaustrophobicThe suffocating enclosure of the deep sea or caverns—closing off the external senses while opening endless subconscious depths inward.

AnnihilativeUnlike the lifelessness of pure black, black blue represents the very process of light's final extinction—charged with near-death desperation.

CamouflagedA color that presents as black on the surface while concealing deep blue within—a sophisticated deception of visual perception.

Deep-DivingLike a submersible, isolating from worldly noise—sinking alone into the darkness of consciousness for painful meditation.

Avant-GardeA rebellious, transgressive color that redefines the taboo of 'colorful black'—representing defiant, advanced artistic vision.

SubzeroThe character of deep sea below zero degrees—cold not only in physics but in its absolute rejection of warmth, its enjoyment of solitude as anti-social.

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