Colour

#B21818

#B21818
Red
Dark
Nearest: Firebrick

#B21818 is a red with RGB values 178, 24, 24 and HSL 0°, 76%, 40%. It is a dark colour, so white text on it reaches 6.9:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#B21818#B21818

HEX#B21818

RGBrgb(178, 24, 24)

RGB (0–1)0.698, 0.0941, 0.0941

RGB percentages69.8%, 9.4%, 9.4%

HSLhsl(0, 76.2%, 39.6%)

HSV / HSBhsv(0, 86.5%, 69.8%)

CMYK0%, 86.5%, 86.5%, 30.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,671,576

CSS custom property--colour: #B21818;

Brightness & contrast

Relative luminance0.10184WCAG 2.x, 0 is black and 1 is white

Perceived brightness99.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.92:1

Contrast with white6.92:1WCAG normal text: AA

Contrast with black3.04:1WCAG normal text: Fail

Greyscale equivalent#393939

Inverted#4DE7E7

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4E4515no red cones; affects about 1% of men; ΔE 62.8 from the original

Deuteranopia#72650Dno green cones; the most common form, about 1% of men; ΔE 62.6 from the original

Tritanopia#C5001Bno blue cones; rare, and affects men and women equally; ΔE 9.1 from the original

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

Contrast with white, large text6.92:1WCAG large text: AAA

Contrast with black, large text3.04:1WCAG large text: AA

Named colours

Firebrick · ΔE 5 Dark red · ΔE 12.4 Brown · ΔE 14.3 Maroon · ΔE 16.6 Crimson · ΔE 17.8 Tomato · ΔE 24.4

Nearest named CSS colourFirebrick (#B22222)ΔE 5.04, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#18B2B2

Analogous#B21865, #B26518

Triadic#18B218, #1818B2

Split complementary#18B265, #1865B2

Tetradic#65B218, #18B2B2, #6518B2

Tints, shades & saturation

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

Lighter +40%#F3A3A3

Lighter +30%#ED7676

Lighter +20%#E74949

Lighter +10%#DF1E1E

Darker −10%#851212

Darker −20%#580C0C

Darker −30%#2B0606

Darker −40%#000000

More saturated +25%#CA0000

Less saturated −25%#993131

Channel breakdown

R178

G24

B24

Red178 (69.8%)

Green24 (9.4%)

Blue24 (9.4%)

Hue0°

Saturation (HSL)76.24%

Lightness39.61%

Dominant channelRed

Hex per channelR B2 · G 18 · B 18

Keep nerding

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

#B21818

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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