Colour
#66001F
- #66001F
- Red
- Dark
- Nearest: Brown
#66001F is a red with RGB values 102, 0, 31 and HSL 342°, 100%, 20%. It is a dark colour, so white text on it reaches 13.3:1 contrast (AAA for normal text). The nearest named colour is Brown.
Colour values
#66001F#66001F
HEX#66001F
RGBrgb(102, 0, 31)
RGB (0–1)0.4, 0, 0.1216
RGB percentages40%, 0%, 12.2%
HSLhsl(341.8, 100%, 20%)
HSV / HSBhsv(341.8, 100%, 40%)
CMYK0%, 100%, 69.6%, 60%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,684,703
CSS custom property--colour: #66001F;
Brightness & contrast
Relative luminance0.02924WCAG 2.x, 0 is black and 1 is white
Perceived brightness56.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 13.25:1
Contrast with white13.25:1WCAG normal text: AAA
Contrast with black1.58:1WCAG normal text: Fail
Greyscale equivalent#181818
Inverted#99FFE0
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text13.25:1WCAG large text: AAA
Contrast with black, large text1.58:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#006647
Analogous#660052, #661400
Triadic#1F6600, #001F66
Split complementary#006614, #005266
Tetradic#526600, #006647, #140066
Tints, shades & saturation
Channel breakdown
R102
G0
B31
Red102 (40%)
Green0 (0%)
Blue31 (12.2%)
Hue341.76°
Saturation (HSL)100%
Lightness20%
Dominant channelRed
Hex per channelR 66 · G 00 · B 1F
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