Recognised as Colour

#FF4B15

#FF4B15
Red
Dark
Nearest: Orange red

#FF4B15 is a red with RGB values 255, 75, 21 and HSL 14°, 100%, 54%. It is a dark colour, so black text on it reaches 6.3:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FF4B15#FF4B15

HEX#FF4B15

RGBrgb(255, 75, 21)

RGB (0–1)1, 0.2941, 0.0824

RGB percentages100%, 29.4%, 8.2%

HSLhsl(13.8, 100%, 54.1%)

HSV / HSBhsv(13.8, 91.8%, 100%)

CMYK0%, 70.6%, 91.8%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,730,901

CSS custom property--colour: #FF4B15;

Brightness & contrast

Relative luminance0.26346WCAG 2.x, 0 is black and 1 is white

Perceived brightness151 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.27:1

Contrast with white3.35:1WCAG normal text: Fail

Contrast with black6.27:1WCAG normal text: AA

Greyscale equivalent#6D6D6D

Inverted#00B4EA

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#827302no red cones; affects about 1% of men; ΔE 72.3 from the original

Deuteranopia#AF9B00no green cones; the most common form, about 1% of men; ΔE 72 from the original

Tritanopia#FF0043no blue cones; rare, and affects men and women equally; ΔE 30.3 from the original

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

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

Contrast with black, large text6.27:1WCAG large text: AAA

Named colours

Orange red · ΔE 4.7 Red · ΔE 15.3 Tomato · ΔE 20.4 Coral · ΔE 28.3 Chocolate · ΔE 30 Dark orange · ΔE 33

Nearest named CSS colourOrange red (#FF4500)ΔE 4.69, a close match

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#15C9FF

Analogous#FF1554, #FFC015

Triadic#15FF4B, #4B15FF

Split complementary#15FFC0, #1554FF

Tetradic#54FF15, #15C9FF, #C015FF

Tints, shades & saturation

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

Lighter +40%#FFE8E1

Lighter +30%#FFC1AE

Lighter +20%#FF997B

Lighter +10%#FF7248

Darker −10%#E13400

Darker −20%#AE2800

Darker −30%#7B1C00

Darker −40%#481100

More saturated +25%#FF4B15

Less saturated −25%#E25B32

Channel breakdown

R255

G75

B21

Red255 (100%)

Green75 (29.4%)

Blue21 (8.2%)

Hue13.85°

Saturation (HSL)100%

Lightness54.12%

Dominant channelRed

Hex per channelR FF · G 4B · B 15

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF4B15 (chemical formula)

Formula
257.14 g/mol
20 atoms

FF4B15 has a molar mass of 257.14 g/mol, made up of 20 atoms across 2 elements: 5 × F, 15 × B.

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Molar mass

Molar mass257.14 g/mol

Total atoms per molecule20

Distinct elements2

Mass of one molecule4.2699102 × 10^-22 g

Molecules per gram2.3419697 × 10^21

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

F36.9%

B63.1%

Fluorine (F × 5)94.99 g/mol, 36.941%

Boron (B × 15)162.15 g/mol, 63.059%

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