All Systems Red
#b30103
A red that is saturated. It is mid — the hardest range to put text on, either colour struggles.
Hex
#b30103
RGB
179, 1, 3
OKLCh
48.2% 0.197 28.9°
CIELAB (D50)
37.9, 61.9, 52.3
What is true of this colour, and of no other
- 13 other named colours sit within ΔE00 2 of it — this part of the space is crowded, and the names here are finer distinctions than most people make.
- 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 82.2; on black, Lc -19.7. 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 37.7 and 40.5 and 44.7 — no red cone.
Text on this colour
White text
7.19:1 — passes AA
Black text
2.92:1 — fails AA
White text is the better of the two at7.19:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#b30103
protanopia
#404009 · ΔE00 37.7
deuteranopia
#666600 · ΔE00 40.5
tritanopia
#828200 · ΔE00 44.7
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isMordant Red 19 at ΔE00 1.202: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Mordant Red 19ΔE00 1.202 · #ae0c00
- Tomato SauceΔE00 1.242 · #b21807
- Thick RedΔE00 1.374 · #b30d0d
- Bloody MaryΔE00 1.437 · #ba0105
- Red LustΔE00 1.467 · #b4090d
- Red DoorΔE00 1.468 · #ac0000
- BullseyeΔE00 1.567 · #b9030a
- Velvet VolcanoΔE00 1.62 · #ab0102
- Red GoreΔE00 1.666 · #ad1400
- Harlock’s CapeΔE00 1.753 · #bb0000
- HeartbeatΔE00 1.856 · #aa0000
- Cave PaintingΔE00 1.879 · #aa1100
7 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.