Recognised as Colour

#FF1315

#FF1315
Red
Dark
Nearest: Red

#FF1315 is a red with RGB values 255, 19, 21 and HSL 359°, 100%, 54%. It is a dark colour, so black text on it reaches 5.4:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#FF1315#FF1315

HEX#FF1315

RGBrgb(255, 19, 21)

RGB (0–1)1, 0.0745, 0.0824

RGB percentages100%, 7.5%, 8.2%

HSLhsl(359.5, 100%, 53.7%)

HSV / HSBhsv(359.5, 92.5%, 100%)

CMYK0%, 92.5%, 91.8%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,716,565

CSS custom property--colour: #FF1315;

Brightness & contrast

Relative luminance0.2178WCAG 2.x, 0 is black and 1 is white

Perceived brightness140.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 5.36:1

Contrast with white3.92:1WCAG normal text: Fail

Contrast with black5.36:1WCAG normal text: AA

Greyscale equivalent#454545

Inverted#00ECEA

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6F610Cno red cones; affects about 1% of men; ΔE 84.9 from the original

Deuteranopia#A49100no green cones; the most common form, about 1% of men; ΔE 84.5 from the original

Tritanopia#FF001Cno blue cones; rare, and affects men and women equally; ΔE 3.4 from the original

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

Contrast with white, large text3.92:1WCAG large text: AA

Contrast with black, large text5.36:1WCAG large text: AAA

Named colours

Red · ΔE 5.5 Orange red · ΔE 13.6 Tomato · ΔE 27.3 Crimson · ΔE 30.1 Firebrick · ΔE 36.4 Coral · ΔE 38.8

Nearest named CSS colourRed (#FF0000)ΔE 5.53, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#13FFFD

Analogous#FF138B, #FF8713

Triadic#15FF13, #1315FF

Split complementary#13FF87, #138BFF

Tetradic#8BFF13, #13FFFD, #8713FF

Tints, shades & saturation

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

Lighter +40%#FFDFDF

Lighter +30%#FFACAD

Lighter +20%#FF797A

Lighter +10%#FF4648

Darker −10%#DF0002

Darker −20%#AC0001

Darker −30%#790001

Darker −40%#460001

More saturated +25%#FF1315

Less saturated −25%#E23132

Channel breakdown

R255

G19

B21

Red255 (100%)

Green19 (7.5%)

Blue21 (8.2%)

Hue359.49°

Saturation (HSL)100%

Lightness53.73%

Dominant channelRed

Hex per channelR FF · G 13 · B 15

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Harmonies

Lighter and darker

Similar named colours

Also reads as

FF1315 (chemical formula)

Formula
25,001.368 g/mol
1316 atoms

FF1315 has a molar mass of 25,001.368 g/mol, made up of 1316 atoms across 1 element: 1316 × F.

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Molar mass

Molar mass25,001.368 g/mol

Total atoms per molecule1316

Distinct elements1

Mass of one molecule4.1515748 × 10^-20 g

Molecules per gram2.4087245 × 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

F100%

Fluorine (F × 1316)25,001.368 g/mol, 100%

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Elements in this formula

Fluorine

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