Recognised as Colour

#C21500

#C21500
Red
Dark
Nearest: Firebrick

#C21500 is a red with RGB values 194, 21, 0 and HSL 6°, 100%, 38%. It is a dark colour, so white text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Firebrick.

Colour values

#C21500#C21500

HEX#C21500

RGBrgb(194, 21, 0)

RGB (0–1)0.7608, 0.0824, 0

RGB percentages76.1%, 8.2%, 0%

HSLhsl(6.5, 100%, 38%)

HSV / HSBhsv(6.5, 100%, 76.1%)

CMYK0%, 89.2%, 100%, 23.9%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer12,719,360

CSS custom property--colour: #C21500;

Brightness & contrast

Relative luminance0.12006WCAG 2.x, 0 is black and 1 is white

Perceived brightness107.3 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 6.17:1

Contrast with white6.17:1WCAG normal text: AA

Contrast with black3.4:1WCAG normal text: Fail

Greyscale equivalent#383838

Inverted#3DEAFF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#554A00no red cones; affects about 1% of men; ΔE 68.3 from the original

Deuteranopia#7D6E00no green cones; the most common form, about 1% of men; ΔE 67.3 from the original

Tritanopia#D70015no blue cones; rare, and affects men and women equally; ΔE 9.2 from the original

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

Contrast with white, large text6.17:1WCAG large text: AAA

Contrast with black, large text3.4:1WCAG large text: AA

Named colours

Firebrick · ΔE 18.8 Orange red · ΔE 22.1 Dark red · ΔE 22.3 Tomato · ΔE 23.2 Crimson · ΔE 23.7 Red · ΔE 24.4

Nearest named CSS colourFirebrick (#B22222)ΔE 18.77, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00ADC2

Analogous#C2004C, #C27600

Triadic#00C215, #1500C2

Split complementary#00C276, #004CC2

Tetradic#4CC200, #00ADC2, #7600C2

Tints, shades & saturation

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

Lighter +40%#FF9B8F

Lighter +30%#FF6E5C

Lighter +20%#FF4029

Lighter +10%#F51B00

Darker −10%#8F0F00

Darker −20%#5C0A00

Darker −30%#290400

Darker −40%#000000

More saturated +25%#C21500

Less saturated −25%#AA2818

Channel breakdown

R194

G21

Red194 (76.1%)

Green21 (8.2%)

Blue0 (0%)

Hue6.49°

Saturation (HSL)100%

Lightness38.04%

Dominant channelRed

Hex per channelR C2 · G 15 · B 00

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Harmonies

Lighter and darker

Similar named colours

Also reads as

C21500 (chemical formula)

Formula
258,236.5 g/mol
21500 atoms

C21500 has a molar mass of 258,236.5 g/mol, made up of 21500 atoms across 1 element: 21500 × C.

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Molar mass

Molar mass258,236.5 g/mol

Total atoms per molecule21500

Distinct elements1

Mass of one molecule4.288118 × 10^-19 g

Molecules per gram2.3320254 × 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

C100%

Carbon (C × 21500)258,236.5 g/mol, 100%

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Elements in this formula

Carbon

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