Recognised as Colour

#FB1300

#FB1300
Red
Dark
Nearest: Red

#FB1300 is a red with RGB values 251, 19, 0 and HSL 5°, 100%, 49%. It is a dark colour, so black text on it reaches 5.2:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FB1300#FB1300

HEX#FB1300

RGBrgb(251, 19, 0)

RGB (0–1)0.9843, 0.0745, 0

RGB percentages98.4%, 7.5%, 0%

HSLhsl(4.5, 100%, 49.2%)

HSV / HSBhsv(4.5, 100%, 98.4%)

CMYK0%, 92.4%, 100%, 1.6%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,454,400

CSS custom property--colour: #FB1300;

Brightness & contrast

Relative luminance0.20975WCAG 2.x, 0 is black and 1 is white

Perceived brightness138 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.19:1

Contrast with white4.04:1WCAG normal text: Fail

Contrast with black5.19:1WCAG normal text: AA

Greyscale equivalent#434343

Inverted#04ECFF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6D5F00no red cones; affects about 1% of men; ΔE 84.4 from the original

Deuteranopia#A28F00no green cones; the most common form, about 1% of men; ΔE 83.2 from the original

Tritanopia#FF0018no blue cones; rare, and affects men and women equally; ΔE 6.7 from the original

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

Contrast with white, large text4.04:1WCAG large text: AA

Contrast with black, large text5.19:1WCAG large text: AAA

Named colours

Red · ΔE 2.5 Orange red · ΔE 11.2 Tomato · ΔE 29.7 Crimson · ΔE 34.2 Firebrick · ΔE 38.7 Coral · ΔE 40.2

Nearest named CSS colourRed (#FF0000)ΔE 2.54, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00E8FB

Analogous#FB006B, #FB9100

Triadic#00FB13, #1300FB

Split complementary#00FB91, #006AFB

Tetradic#6AFB00, #00E8FB, #9000FB

Tints, shades & saturation

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

Lighter +40%#FFCCC8

Lighter +30%#FF9D95

Lighter +20%#FF6E62

Lighter +10%#FF3F2F

Darker −10%#C80F00

Darker −20%#950B00

Darker −30%#620700

Darker −40%#2F0400

More saturated +25%#FB1300

Less saturated −25%#DC2E1F

Channel breakdown

R251

G19

Red251 (98.4%)

Green19 (7.5%)

Blue0 (0%)

Hue4.54°

Saturation (HSL)100%

Lightness49.22%

Dominant channelRed

Hex per channelR FB · G 13 · B 00

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FB1300 (chemical formula)

Formula
14,071.998 g/mol
1301 atoms

FB1300 has a molar mass of 14,071.998 g/mol, made up of 1301 atoms across 2 elements: 1 × F, 1300 × B.

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Molar mass

Molar mass14,071.998 g/mol

Total atoms per molecule1301

Distinct elements2

Mass of one molecule2.3367102 × 10^-20 g

Molecules per gram4.2795208 × 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

F0.1%

B99.9%

Fluorine (F)18.998 g/mol, 0.135%

Boron (B × 1300)14,053 g/mol, 99.865%

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