Recognised as Colour

#B31A1A

#B31A1A
Red
Dark
Nearest: Firebrick

#B31A1A is a red with RGB values 179, 26, 26 and HSL 0°, 75%, 40%. It is a dark colour, so white text on it reaches 6.8:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#B31A1A#B31A1A

HEX#B31A1A

RGBrgb(179, 26, 26)

RGB (0–1)0.702, 0.102, 0.102

RGB percentages70.2%, 10.2%, 10.2%

HSLhsl(0, 74.6%, 40.2%)

HSV / HSBhsv(0, 85.5%, 70.2%)

CMYK0%, 85.5%, 85.5%, 29.8%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,737,626

CSS custom property--colour: #B31A1A;

Brightness & contrast

Relative luminance0.10397WCAG 2.x, 0 is black and 1 is white

Perceived brightness100.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.82:1

Contrast with white6.82:1WCAG normal text: AA

Contrast with black3.08:1WCAG normal text: Fail

Greyscale equivalent#3B3B3B

Inverted#4CE5E5

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4F4617no red cones; affects about 1% of men; ΔE 62.6 from the original

Deuteranopia#736610no green cones; the most common form, about 1% of men; ΔE 62.5 from the original

Tritanopia#C6001Dno blue cones; rare, and affects men and women equally; ΔE 9.4 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text6.82:1WCAG large text: AAA

Contrast with black, large text3.08:1WCAG large text: AA

Named colours

Firebrick · ΔE 4.4 Dark red · ΔE 12.6 Brown · ΔE 13.8 Maroon · ΔE 16.7 Crimson · ΔE 17.4 Tomato · ΔE 24.2

Nearest named CSS colourFirebrick (#B22222)ΔE 4.4, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#1AB3B3

Analogous#B31A67, #B3671A

Triadic#1AB31A, #1A1AB3

Split complementary#1AB367, #1A67B3

Tetradic#67B31A, #1AB3B3, #671AB3

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#F2A7A7

Lighter +30%#EC7A7A

Lighter +20%#E54E4E

Lighter +10%#DF2121

Darker −10%#861414

Darker −20%#5A0D0D

Darker −30%#2D0707

Darker −40%#010000

More saturated +25%#CD0000

Less saturated −25%#993434

Channel breakdown

R179

G26

B26

Red179 (70.2%)

Green26 (10.2%)

Blue26 (10.2%)

Hue0°

Saturation (HSL)74.63%

Lightness40.2%

Dominant channelRed

Hex per channelR B3 · G 1A · B 1A

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

#B31A1A

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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