Recognised as Colour

#CA151F

#CA151F
Red
Dark
Nearest: Firebrick

#CA151F is a red with RGB values 202, 21, 31 and HSL 357°, 81%, 44%. It is a dark colour, so white text on it reaches 5.8:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#CA151F#CA151F

HEX#CA151F

RGBrgb(202, 21, 31)

RGB (0–1)0.7922, 0.0824, 0.1216

RGB percentages79.2%, 8.2%, 12.2%

HSLhsl(356.7, 81.2%, 43.7%)

HSV / HSBhsv(356.7, 89.6%, 79.2%)

CMYK0%, 89.6%, 84.7%, 20.8%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer13,243,679

CSS custom property--colour: #CA151F;

Brightness & contrast

Relative luminance0.13192WCAG 2.x, 0 is black and 1 is white

Perceived brightness112.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 5.77:1

Contrast with white5.77:1WCAG normal text: AA

Contrast with black3.64:1WCAG normal text: Fail

Greyscale equivalent#3C3C3C

Inverted#35EAE0

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#574D1Cno red cones; affects about 1% of men; ΔE 70.2 from the original

Deuteranopia#817313no green cones; the most common form, about 1% of men; ΔE 70.5 from the original

Tritanopia#DF001Dno blue cones; rare, and affects men and women equally; ΔE 10.1 from the original

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

Contrast with white, large text5.77:1WCAG large text: AAA

Contrast with black, large text3.64:1WCAG large text: AA

Named colours

Firebrick · ΔE 12.4 Crimson · ΔE 13.1 Tomato · ΔE 20.6 Dark red · ΔE 21 Brown · ΔE 21.8 Maroon · ΔE 25.5

Nearest named CSS colourFirebrick (#B22222)ΔE 12.37, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#15CAC0

Analogous#CA1579, #CA6515

Triadic#1FCA15, #151FCA

Split complementary#15CA65, #1579CA

Tetradic#7ACA15, #15CAC0, #6615CA

Tints, shades & saturation

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

Lighter +40%#F7B4B8

Lighter +30%#F2868C

Lighter +20%#EE5760

Lighter +10%#E92934

Darker −10%#9C1018

Darker −20%#6E0B11

Darker −30%#3F070A

Darker −40%#110203

More saturated +25%#DF000C

Less saturated −25%#AE3138

Channel breakdown

R202

G21

B31

Red202 (79.2%)

Green21 (8.2%)

Blue31 (12.2%)

Hue356.69°

Saturation (HSL)81.17%

Lightness43.73%

Dominant channelRed

Hex per channelR CA · G 15 · B 1F

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Harmonies

Lighter and darker

Similar named colours

Also reads as

Ca151F (chemical formula)

Formula
6,070.776 g/mol
152 atoms

Ca151F has a molar mass of 6,070.776 g/mol, made up of 152 atoms across 2 elements: 151 × Ca, 1 × F.

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Molar mass

Molar mass6,070.776 g/mol

Total atoms per molecule152

Distinct elements2

Mass of one molecule1.0080761 × 10^-20 g

Molecules per gram9.9198863 × 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

Ca99.7%

F0.3%

Calcium (Ca × 151)6,051.778 g/mol, 99.687%

Fluorine (F)18.998 g/mol, 0.313%

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