Signal Red

RAL 3001 Signal Red, standard color for warning and safety marking

HEX#9B2423

RGBrgb(155, 36, 35)

HSLhsl(0, 63%, 37%)

HSVhsv(0, 77%, 61%)

CMYKcmyk(0%, 77%, 77%, 39%)

HEXA#9B2423FF

RGBArgba(155, 36, 35, 1)

HSLAhsla(0, 63%, 37%, 1)

OKLCHoklch(63.7%, 0.127, 22)

LCHlch(56.1%, 36.9, 26)

🎨 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

#FBEEEERatio 7:1AAA

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

Aa14px Body

Standard Text

#E6BD93Ratio 4.5:1AA

Suitable for regular body content, meeting WCAG AA standards

Aa14px Body

Large Text / UI Components

#A6A626Ratio 3:1AA Large

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

Aa14px Body

Decorative / Dividers

#239A23Ratio 2.1:1Fail

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%

#2E0A0A

#3E0E0E

#531313

#641717

#741A1A

#891F1F

#9A2323

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

#764747

#7D4040

#823A3A

#883535

#8E2F2F

#942929

#9A2323

Lightness + Saturation Mixed VariationSimultaneous lightness and saturation proportional scaling

#211717

#301C1C

#442222

#562424

#6A2525

#832525

#9A2323

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

#9A2341

#9A2337

#9A232D

#9A2323

#9A2D23

#9A3723

#9A4123

💡 Use Cases

🚂

Railway Signaling

Safeguarding every train’s journey from steam locomotives to high-speed railways.

🚫

Prohibition Signs

Palette for internationally recognized stop and prohibition markers, transmitting clear safety instructions across language barriers.

🛑

Emergency Stop Buttons

Emergency stop buttons on industrial machinery and public facilities, the most reliable safety guarantee in crises.

🚢

Marine Warnings

Warning color for lighthouses and navigation buoys, marking safe routes across open waters.

📜 Origin & History

RAL 3001 Signal Red is the designated safety warning color within German industrial standards. As rail and highway transport expanded in the early 20th century, unified signaling systems required standardized red.

Signal Red was tested extensively to guarantee high visibility under all weather and lighting conditions. This moderately dark red proved most distinguishable at long distances and against backlight.

The European Committee for Standardization incorporated Signal Red into safety signage systems. Prohibition signs, fire equipment and emergency stop buttons uniformly adopt Signal Red, forming an international safety language transcending words.

Within railway signaling, Signal Red means halt and danger. From steam age to high-speed rail era, Signal Red safeguards safe operation of every train.

Signal Red applications have expanded to traffic signage, aviation ground equipment and marine warning systems. Even in Industry 4.0, Signal Red remains the most dependable safety guard color in the physical world.

🧠 Color Psychology

Heightened AlertnessSignal Red instantly raises human awareness, acting as the most effective visual alarm.

Safety ProtectionBehind its stern appearance lies protection for human lives; Signal Red stands against hazards.

Strict ComplianceSignal Red represents non-negotiable rule boundaries, an enforcer of order and discipline.

Clear DefinitionAmid ambiguity and chaos, Signal Red delivers unambiguous guidance with no room for vagueness.

Sense of ResponsibilityAs the official safety standard hue, Signal Red carries heavy accountability for public safety.

Trustworthy ReliabilityThe sight of Signal Red confirms safety systems are operational; it is a color worthy of full confidence.

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