RAL 9004
Signal Black
RAL 9004 Signal Black is a standardized dark shade from the RAL signal color family, designated for safety signage and high-contrast visual communication systems. This deep, neutral black provides maximum contrast against signal white and other bright safety colors, ensuring readability of critical safety information in industrial and public environments. Signal Black is slightly lighter than jet black, which can make it more practical for applications where absolute black would show dust and fingerprints too readily.
Color Reference
WCAG 2.1 AA requires 4.5:1 contrast for normal text. Results show this color as a background.
Spectrum & Perceptual Position
CIELAB is a perceptually uniform color space. Euclidean distance between two colors in this diagram closely matches human visual difference. The dot size shows your selected color; slightly larger dots are the nearest perceptual neighbors.
Build a Palette Around Signal Black
Palette Generator
Select a harmony type, then press Space to reroll unlocked colors.
Reference + opposite hue with tonal variations
Contrast ratios follow WCAG 2.1 guidelines. Green (≥4.5:1) passes AA for normal text. Amber (≥3:1) passes for large text only. Grey indicates low contrast.
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