Recognised as Colour

#FF550C

#FF550C
Orange
Dark
Nearest: Orange red

#FF550C is a orange with RGB values 255, 85, 12 and HSL 18°, 100%, 52%. It is a dark colour, so black text on it reaches 6.6:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FF550C#FF550C

HEX#FF550C

RGBrgb(255, 85, 12)

RGB (0–1)1, 0.3333, 0.0471

RGB percentages100%, 33.3%, 4.7%

HSLhsl(18, 100%, 52.4%)

HSV / HSBhsv(18, 95.3%, 100%)

CMYK0%, 66.7%, 95.3%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,733,452

CSS custom property--colour: #FF550C;

Brightness & contrast

Relative luminance0.27784WCAG 2.x, 0 is black and 1 is white

Perceived brightness153.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.56:1

Contrast with white3.2:1WCAG normal text: Fail

Contrast with black6.56:1WCAG normal text: AA

Greyscale equivalent#747474

Inverted#00AAF3

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#887800no red cones; affects about 1% of men; ΔE 68.6 from the original

Deuteranopia#B29E00no green cones; the most common form, about 1% of men; ΔE 68.4 from the original

Tritanopia#FF134Ano blue cones; rare, and affects men and women equally; ΔE 37.2 from the original

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

Contrast with white, large text3.2:1WCAG large text: AA

Contrast with black, large text6.56:1WCAG large text: AAA

Named colours

Orange red · ΔE 6.2 Red · ΔE 19.1 Tomato · ΔE 21.9 Coral · ΔE 27.4 Chocolate · ΔE 27.6 Dark orange · ΔE 28.2

Nearest named CSS colourOrange red (#FF4500)ΔE 6.15, clearly different but related

Hue familyorange

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#0CB6FF

Analogous#FF0C3C, #FFCF0C

Triadic#0CFF55, #550CFF

Split complementary#0CFFCF, #0C3CFF

Tetradic#3CFF0C, #0CB6FF, #CF0CFF

Tints, shades & saturation

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

Lighter +40%#FFE4D8

Lighter +30%#FFC0A5

Lighter +20%#FF9C72

Lighter +10%#FF793F

Darker −10%#D84100

Darker −20%#A53200

Darker −30%#722200

Darker −40%#3F1300

More saturated +25%#FF550C

Less saturated −25%#E1612A

Channel breakdown

R255

G85

B12

Red255 (100%)

Green85 (33.3%)

Blue12 (4.7%)

Hue18.02°

Saturation (HSL)100%

Lightness52.35%

Dominant channelRed

Hex per channelR FF · G 55 · B 0C

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF550C (chemical formula)

Formula
10,479.909 g/mol
552 atoms

FF550C has a molar mass of 10,479.909 g/mol, made up of 552 atoms across 2 elements: 551 × F, 1 × C.

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Molar mass

Molar mass10,479.909 g/mol

Total atoms per molecule552

Distinct elements2

Mass of one molecule1.7402298 × 10^-20 g

Molecules per gram5.7463674 × 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

F99.9%

C0.1%

Fluorine (F × 551)10,467.898 g/mol, 99.885%

Carbon (C)12.011 g/mol, 0.115%

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Elements in this formula

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