Recognised as Colour

#BB2121

#BB2121
Red
Dark
Nearest: Firebrick

#BB2121 is a red with RGB values 187, 33, 33 and HSL 0°, 70%, 43%. It is a dark colour, so white text on it reaches 6.3:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#BB2121#BB2121

HEX#BB2121

RGBrgb(187, 33, 33)

RGB (0–1)0.7333, 0.1294, 0.1294

RGB percentages73.3%, 12.9%, 12.9%

HSLhsl(0, 70%, 43.1%)

HSV / HSBhsv(0, 82.4%, 73.3%)

CMYK0%, 82.4%, 82.4%, 26.7%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,263,713

CSS custom property--colour: #BB2121;

Brightness & contrast

Relative luminance0.11762WCAG 2.x, 0 is black and 1 is white

Perceived brightness105.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.26:1

Contrast with white6.26:1WCAG normal text: AA

Contrast with black3.35:1WCAG normal text: Fail

Greyscale equivalent#424242

Inverted#44DEDE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#544B1Eno red cones; affects about 1% of men; ΔE 63.4 from the original

Deuteranopia#796C19no green cones; the most common form, about 1% of men; ΔE 63.5 from the original

Tritanopia#CE0024no blue cones; rare, and affects men and women equally; ΔE 10.4 from the original

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

Contrast with white, large text6.26:1WCAG large text: AAA

Contrast with black, large text3.35:1WCAG large text: AA

Named colours

Firebrick · ΔE 4.4 Brown · ΔE 13.9 Dark red · ΔE 15 Crimson · ΔE 15.3 Maroon · ΔE 18.8 Tomato · ΔE 22.2

Nearest named CSS colourFirebrick (#B22222)ΔE 4.39, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#21BBBB

Analogous#BB216E, #BB6E21

Triadic#21BB21, #2121BB

Split complementary#21BB6E, #216EBB

Tetradic#6EBB21, #21BBBB, #6E21BB

Tints, shades & saturation

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

Lighter +40%#F2B6B6

Lighter +30%#EA8B8B

Lighter +20%#E35F5F

Lighter +10%#DB3434

Darker −10%#901919

Darker −20%#641212

Darker −30%#390A0A

Darker −40%#0E0202

More saturated +25%#D60606

Less saturated −25%#A03D3D

Channel breakdown

R187

G33

B33

Red187 (73.3%)

Green33 (12.9%)

Blue33 (12.9%)

Hue0°

Saturation (HSL)70%

Lightness43.14%

Dominant channelRed

Hex per channelR BB · G 21 · B 21

Keep nerding

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

Harmonies

Lighter and darker

Similar named colours

Also reads as

BB2121 (chemical formula)

Formula
22,938.82 g/mol
2122 atoms

BB2121 has a molar mass of 22,938.82 g/mol, made up of 2122 atoms across 1 element: 2122 × B.

Open this reading on its own page →

Molar mass

Molar mass22,938.82 g/mol

Total atoms per molecule2122

Distinct elements1

Mass of one molecule3.8090807 × 10^-20 g

Molecules per gram2.6253054 × 10^19

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 × 2122)22,938.82 g/mol, 100%

Keep nerding

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

Elements in this formula

Boron

Nerdulate something else

Nothing in mind? Surprise me · today’s page