Turquoise Tortoise
#457b74
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
#457b74
RGB
69, 123, 116
OKLCh
54.3% 0.059 185.0°
CIELAB (D50)
47.7, -20.2, -2.1
What is true of this colour, and of no other
- One other named colour sits within ΔE00 2 of it.
- It uses 61% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 73.5; on black, Lc -28.2. 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 17.7 and 19.5 and 30.2 — no red cone.
Text on this colour
White text
4.84:1 — passes AA
Black text
4.34:1 — large text only
White text is the better of the two at4.84:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#457b74
protanopia
#767674 · ΔE00 17.7
deuteranopia
#6f6f75 · ΔE00 19.5
tritanopia
#6565ca · ΔE00 30.2
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isSea Pea at ΔE00 0.857: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Sea PeaΔE00 0.857 · #457973
- Faded JadeΔE00 2.262 · #427977
- Bubble TurquoiseΔE00 2.354 · #43817a
- Tandayapa Cloud ForestΔE00 2.462 · #4a766e
- Azurite Water GreenΔE00 2.5 · #497f73
- Pearl GreenΔE00 2.773 · #377b70
- Green SleevesΔE00 2.87 · #39766c
- Surf GreenΔE00 3.04 · #427573
- Myrtle GreenΔE00 3.115 · #317873
- Double JeopardyΔE00 3.173 · #4d786c
- Breaker BayΔE00 3.181 · #517b78
- Hooker’s GreenΔE00 3.248 · #49796b
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.