Petrol Slumber
#243640
A neutral that has no useful hue — it reads as a grey. It is dark — it carries white text and needs care with black.
Hex
#243640
RGB
36, 54, 64
OKLCh
32.2% 0.029 233.2°
CIELAB (D50)
21.4, -5.2, -8.7
What is true of this colour, and of no other
- No other named colour in the set is within ΔE00 2 of it — it stands alone.
- It uses 44% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 98.4; on black, Lc 0.0. The sign is the polarity, which the WCAG ratio discards.
- Built into an eleven-step scale, 10 of the 10 adjacent pairs stay ΔE00 2 apart — see the ramp.
- protanopia and deuteranopia and tritanopia shift it by ΔE00 9.6 and 10.3 and 14.9 — no red cone.
Text on this colour
White text
12.52:1 — passes AA
Black text
1.68:1 — fails AA
White text is the better of the two at12.52:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#243640
protanopia
#343440 · ΔE00 9.6
deuteranopia
#313140 · ΔE00 10.3
tritanopia
#2e2e5d · ΔE00 14.9
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isCool Current at ΔE00 2.412: between 2 and 5 — clearly two colours when compared, easily mistaken from memory. What the numbers mean.
- Cool CurrentΔE00 2.412 · #283c44
- PrecisionΔE00 2.629 · #2c3944
- Blue-BlackΔE00 3.044 · #24313d
- Freinacht BlackΔE00 3.048 · #232f36
- ElectromagneticΔE00 3.325 · #2e3840
- AnchormanΔE00 3.711 · #2c3641
- Tempest in a TeapotΔE00 3.718 · #303a40
- Deepsea CoreΔE00 3.874 · #303f4c
- Dracula OrchidΔE00 4.162 · #2c3539
- Big StoneΔE00 4.211 · #334046
- Chimney SweepΔE00 4.547 · #272f38
- Biro BlueΔE00 4.578 · #2f3946
11 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.