Brilliant Blue (RAL 5007)

RAL brilliant blue, an elegant greyish-blue with subtle undertones

HEX#41678D

RGBrgb(65, 103, 141)

HSLhsl(210, 37%, 40%)

HSVhsv(210, 54%, 55%)

CMYKcmyk(54%, 27%, 0%, 45%)

HEXA#41678DFF

RGBArgba(65, 103, 141, 1)

HSLAhsla(210, 37%, 40%, 1)

OKLCHoklch(72.4%, 0.052, 243)

LCHlch(68.2%, 24.1, 243)

🎨 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

#FFFFFFRatio 5.9:1AA

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

Aa14px Body

Standard Text

#E0E0F1Ratio 4.5:1AA

Suitable for regular body content, meeting WCAG AA standards

Aa14px Body

Large Text / UI Components

#C4AFDARatio 3:1AA Large

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

Aa14px Body

Decorative / Dividers

#C581A3Ratio 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%

#131F2A

#1B2B3B

#223649

#2A425B

#324F6C

#38597A

#40668C

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

#576675

#536679

#50667C

#4B6681

#476685

#446688

#40668C

Lightness + Saturation Mixed VariationSimultaneous lightness and saturation proportional scaling

#1B1F22

#252B32

#2B3640

#324252

#394F65

#3C5977

#40668C

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

#40798C

#40738C

#406C8C

#40668C

#40608C

#40598C

#40538C

💡 Use Cases

🖊️

Business Signatures

Ink color for premium rollerball pens—more lively than black, more serious than blue when signing contracts, with a restrained executive elegance.

👔

French Cuffs

Enamel cufflinks for Windsor-collar shirts—the grey-blue discreetly echoing the suit, revealing taste only when hands move.

📐

Blueprint Details

Layer colors for architects and structural engineers in CAD backgrounds—precisely delineating MEP systems without conflicting with walls.

💻

Online Documents

Dark mode sidebars in apps like Feishu or Notion—providing a professional dark environment that doesn't strain the eyes.

📜 Origin & History

RAL 5007 Brilliant Blue is not an electric fluorescent blue but a soft, greyish intermediate blue. Introduced by RAL during the European economic recovery, it was designed to offer a more humane alternative to off-white for metal office furniture in modernist office buildings.

In the 1980s, with the rise of computer-aided design, brilliant blue became the standard annotation color on engineering drawings. On blue-print paper, this greyish blue could clearly mark without being harsh, accompanying architects through the transition from hand-drafting to CAD.

In textiles, this color is a staple of premium business shirts. Shedding the cheapness of white shirts and the over-conservatism of dark blues, its moderate brightness and cool-grey tones perfectly complement Asian skin tones, making it a closet essential for white-collar workers.

In the digital workflow era, brilliant blue's screen-friendliness makes it ideal for dark mode in enterprise collaboration software and online documents. It maintains appropriate grey values on both white and dark backgrounds—professional and fatigue-free.

🧠 Color Psychology

ScholarlyA learned, gentlemanly quality—bookish refinement mixed with elite cultivation, maintaining a comfortable interpersonal distance.

NeutralA moderate base that tempers all extremes—heated arguments seem to drop several decibels at its presence.

LucidEven in dim interiors it avoids gloominess—like frosted glass, emitting a hazy yet stable glow.

ReasonableRepresenting flattened communication in modern corporate collaboration—replacing hierarchy with rationality and objective, sensible discussion.

Intuitive ConsensusA color requiring no extensive explanation—relying on instinct and established corporate culture to maintain team synchronization.

HomogeneousVisually absolute uniformity, free of brushstrokes and noise—like precision-sprayed lacquer, the ultimate expression of modern industrial aesthetics.

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