Recognised as Colour

#21010A

#21010A
Red
Dark
Nearest: Black

#21010A is a red with RGB values 33, 1, 10 and HSL 343°, 94%, 7%. It is a dark colour, so white text on it reaches 19.6:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#21010A#21010A

HEX#21010A

RGBrgb(33, 1, 10)

RGB (0–1)0.1294, 0.0039, 0.0392

RGB percentages12.9%, 0.4%, 3.9%

HSLhsl(343.1, 94.1%, 6.7%)

HSV / HSBhsv(343.1, 97%, 12.9%)

CMYK0%, 97%, 69.7%, 87.1%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer2,162,954

CSS custom property--colour: #21010A;

Brightness & contrast

Relative luminance0.00367WCAG 2.x, 0 is black and 1 is white

Perceived brightness18.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 19.56:1

Contrast with white19.56:1WCAG normal text: AAA

Contrast with black1.07:1WCAG normal text: Fail

Greyscale equivalent#080808

Inverted#DEFEF5

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#07080Ano red cones; affects about 1% of men; ΔE 14.3 from the original

Deuteranopia#100F09no green cones; the most common form, about 1% of men; ΔE 14.8 from the original

Tritanopia#250004no blue cones; rare, and affects men and women equally; ΔE 3.8 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text19.56:1WCAG large text: AAA

Contrast with black, large text1.07:1WCAG large text: Fail

Named colours

Black · ΔE 14.5 Dark slate grey · ΔE 38.3 Dim grey · ΔE 43.5 Gray · ΔE 52.2 Dark slateblue · ΔE 52.6 Slate grey · ΔE 53.4

Nearest named CSS colourBlack (#000000)ΔE 14.52, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#012118

Analogous#21011A, #210801

Triadic#0A2101, #010A21

Split complementary#012108, #011A21

Tetradic#1A2101, #012118, #080121

Tints, shades & saturation

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

Lighter +40%#E70746

Lighter +30%#B60537

Lighter +20%#840428

Lighter +10%#530219

Darker −10%#000000

Darker −20%#000000

Darker −30%#000000

Darker −40%#000000

More saturated +25%#22000A

Less saturated −25%#1D050C

Channel breakdown

R33

B10

Red33 (12.9%)

Green1 (0.4%)

Blue10 (3.9%)

Hue343.13°

Saturation (HSL)94.12%

Lightness6.67%

Dominant channelRed

Hex per channelR 21 · G 01 · B 0A

Keep nerding

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#21010A

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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