Recognised as Colour

#B10217

#B10217
Red
Dark
Nearest: Firebrick

#B10217 is a red with RGB values 177, 2, 23 and HSL 353°, 98%, 35%. It is a dark colour, so white text on it reaches 7.3:1 contrast (AAA for normal text). The nearest named colour is Firebrick.

Colour values

#B10217#B10217

HEX#B10217

RGBrgb(177, 2, 23)

RGB (0–1)0.6941, 0.0078, 0.0902

RGB percentages69.4%, 0.8%, 9%

HSLhsl(352.8, 97.8%, 35.1%)

HSV / HSBhsv(352.8, 98.9%, 69.4%)

CMYK0%, 98.9%, 87%, 30.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer11,600,407

CSS custom property--colour: #B10217;

Brightness & contrast

Relative luminance0.09452WCAG 2.x, 0 is black and 1 is white

Perceived brightness97.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 7.27:1

Contrast with white7.27:1WCAG normal text: AAA

Contrast with black2.89:1WCAG normal text: Fail

Greyscale equivalent#292929

Inverted#4EFDE8

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#494015no red cones; affects about 1% of men; ΔE 65.5 from the original

Deuteranopia#6F630Ano green cones; the most common form, about 1% of men; ΔE 66 from the original

Tritanopia#C40010no blue cones; rare, and affects men and women equally; ΔE 10.2 from the original

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

Contrast with white, large text7.27:1WCAG large text: AAA

Contrast with black, large text2.89:1WCAG large text: Fail

Named colours

Firebrick · ΔE 6.7 Dark red · ΔE 13.3 Brown · ΔE 15.7 Crimson · ΔE 16.2 Maroon · ΔE 17.5 Tomato · ΔE 26

Nearest named CSS colourFirebrick (#B22222)ΔE 6.71, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#02B19C

Analogous#B1026F, #B14502

Triadic#17B102, #0217B1

Split complementary#02B145, #026FB1

Tetradic#6EB102, #02B19C, #4402B1

Tints, shades & saturation

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

Lighter +40%#FE8190

Lighter +30%#FD4F64

Lighter +20%#FC1D37

Lighter +10%#E3031E

Darker −10%#7F0110

Darker −20%#4C010A

Darker −30%#1A0003

Darker −40%#000000

More saturated +25%#B30015

Less saturated −25%#9B1828

Channel breakdown

R177

B23

Red177 (69.4%)

Green2 (0.8%)

Blue23 (9%)

Hue352.8°

Saturation (HSL)97.77%

Lightness35.1%

Dominant channelRed

Hex per channelR B1 · G 02 · B 17

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Harmonies

Lighter and darker

Similar named colours

Also reads as

B10217 (chemical formula)

Formula
110,445.77 g/mol
10217 atoms

B10217 has a molar mass of 110,445.77 g/mol, made up of 10217 atoms across 1 element: 10217 × B.

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Molar mass

Molar mass110,445.77 g/mol

Total atoms per molecule10217

Distinct elements1

Mass of one molecule1.8339952 × 10^-19 g

Molecules per gram5.4525771 × 10^18

Name

NameNot in the name tablea name cannot be worked out from a formula alone: isomers share formulas, and naming depends on bonding the formula does not show

Composition by mass

B100%

Boron (B × 10217)110,445.77 g/mol, 100%

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Elements in this formula

Boron

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