Deep Sea Diver
#255c61
A cyan that is nearly neutral — the hue shows only against a true grey. It is mid — the hardest range to put text on, either colour struggles.
Hex
#255c61
RGB
37, 92, 97
OKLCh
44.0% 0.058 203.4°
CIELAB (D50)
35.6, -17.5, -8.7
What is true of this colour, and of no other
- 5 other named colours sit within ΔE00 2 of it.
- It uses 77% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 86.0; on black, Lc -16.0. 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 18.7 and 20.2 and 24.6 — no red cone.
Text on this colour
White text
7.55:1 — passes AA
Black text
2.78:1 — fails AA
White text is the better of the two at7.55:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#255c61
protanopia
#585861 · ΔE00 18.7
deuteranopia
#505062 · ΔE00 20.2
tritanopia
#4747a7 · ΔE00 24.6
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isTerrace Teal at ΔE00 0.532: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Terrace TealΔE00 0.532 · #275b60
- Inner SpaceΔE00 0.698 · #285b5f
- Gulf HarbourΔE00 0.904 · #225e64
- Moonlit PoolΔE00 1.135 · #205a61
- BayberryΔE00 1.139 · #275a5d
- Sea ChallengeΔE00 2.077 · #2c585c
- Tropical SkiesΔE00 2.132 · #155d66
- Calypso GreenΔE00 2.177 · #2e5f60
- UnchartedΔE00 2.471 · #19565e
- Blue EmeraldΔE00 2.489 · #0f5a5e
- Deep MarineΔE00 2.784 · #2e6469
- Emerald PoolΔE00 2.802 · #155e60
12 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.