Yellow

RAL 1016

Sulfur Yellow

RAL 1016 Sulfur Yellow is a vivid, almost fluorescent yellow-green that is impossible to miss. This is the standard color for European ambulances in accordance with CEN 1789, chosen specifically for its exceptional visibility in all lighting conditions. The color's high luminance value makes it one of the most eye-catching shades in the RAL system. Beyond emergency vehicles, it is used for high-visibility safety equipment, industrial hazard markings, and sports equipment where maximum visibility is critical.

Time9:36 AM
Light
Technical Reference

Color Reference

Hex#EDFF21
RGBrgb(237, 255, 33)
HSLhsl(65°, 100%, 56%)
CMYKcmyk(7%, 0%, 87%, 0%)
Color Analysis
RGB Composition
R
237
G
255
B
33
Temperature
WarmCool
Contrast Accessibility
White text
1.1:1Fail
Black text
18.9:1Pass

WCAG 2.1 AA requires 4.5:1 contrast for normal text. Results show this color as a background.

Spectrum & Perceptual Position

Hue Spectrum
60°120°180°240°300°360°
CIELAB a*b* Chromaticity
-4004080-4004080a* (Green ← → Red)b* (Blue ← → Yellow)
L* (Lightness)96
a* (Green-Red)-29
b* (Blue-Yellow)90
L* (LCh)96
C* (Chroma)94
h° (Hue)108°

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.

Color Harmonies

Build a Palette Around Sulfur Yellow

Palette Generator

Select a harmony type, then press Space to reroll unlocked colors.

1 locked / 4 free

Reference + opposite hue with tonal variations

Reference
#2
Complementary
#3
Complementary
#4
Complementary
#5
Split Comp +
Pairwise Contrast Ratios
11.3:1
·
1.9:1
·
1.8:1
·
1.5:1

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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