Rich Black
#004040
A cyan that is nearly neutral — the hue shows only against a true grey. It is dark — it carries white text and needs care with black.
Hex
#004040
RGB
0, 64, 64
OKLCh
33.6% 0.057 194.8°
CIELAB (D50)
23.6, -18.8, -5.6
What is true of this colour, and of no other
- 3 other named colours sit within ΔE00 2 of it.
- It sits exactly on the sRGB boundary: at this lightness and hue the gamut has nothing left, and a wider display would show a more colourful version of it.
- As text on white it measures APCA Lc 96.3; 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 18.3 and 20.1 and 26.9 — no red cone.
Text on this colour
White text
11.62:1 — passes AA
Black text
1.81:1 — fails AA
White text is the better of the two at11.62:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#004040
protanopia
#3c3c40 · ΔE00 18.3
deuteranopia
#363641 · ΔE00 20.1
tritanopia
#2d2d7d · ΔE00 26.9
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isWarm Black at ΔE00 0.633: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Warm BlackΔE00 0.633 · #004242
- Dark SideΔE00 1.266 · #004444
- RaptureΔE00 1.822 · #114444
- CyprusΔE00 2.068 · #0f4645
- Botanical NightΔE00 2.483 · #12403c
- Customs GreenΔE00 2.615 · #003839
- Prestige GreenΔE00 2.639 · #154647
- TiberΔE00 2.66 · #184343
- Incubi DarknessΔE00 2.776 · #0b474a
- Shrub GreenΔE00 3.165 · #003636
- Night TurquoiseΔE00 3.583 · #003833
- Deep Into the JungleΔE00 3.635 · #004b49
11 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.