HEX atlas value

#AC1F15

#AC1F15 is a warm red HEX color close to Firebrick. According to Colors Encyclopedia, it converts to RGB 172, 31, 21, HSL 4, 78%, 38%, has luminance 0.098, and belongs to the vibrant group.

red warm vibrant

#AC1F15 Sample readable text

HEX #AC1F15

RGB rgb(172, 31, 21)

HSL hsl(4 78% 38%)

CMYK cmyk(0, 82, 88, 33)

Luminance 0.098

Contrast Black 2.96:1White 7.09:1

CSS

--color-ac1f15: #AC1F15;
.background-ac1f15 { background-color: #AC1F15; }
.text-ac1f15 { color: #AC1F15; }

Luminance0.098

Black text2.96:1AA Fail

White text7.09:1AA Pass

hexCanonical HEX value

rgbRed, green, blue channels

hslHue, saturation, lightness

cmykApproximate print conversion

wcagAA and AAA contrast options

harmoniesMathematical harmony sets

variantsGenerated tone variants

nearestColorsKnowledge graph neighbors

Structured sections

Color systems

{"hex":"#AC1F15","rgb":[172,31,21],"hsl":[4,78,38],"cmyk":[0,82,88,33],"luminance":0.098,"contrast":{"black":2.96,"white":7.09}}

WCAG

{"AA":["#FFFFFF","#F5F5F5"],"AAA":["#FFFFFF"]}

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":2.96,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":7.09,"wcagAA":true,"wcagAAA":true}]

Accessible alternatives

[{"name":"#5B110B","hex":"#5B110B","family":"red","bestTextColor":"#FFFFFF","contrastBlack":1.53,"contrastWhite":13.73,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Ruby Red","hex":"#9B111E","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.49,"contrastWhite":8.43,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#97322B","hex":"#97322B","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.81,"contrastWhite":7.48,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"Pompeian Red","hex":"#A42A04","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.91,"contrastWhite":7.21,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"Brown","hex":"#A52A2A","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.96,"contrastWhite":7.09,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]}]

AI context

{"semanticGroups":["warm red","vibrant","vibrant red","Firebrick adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","high-attention visual states"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/ac1f15.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/firebrick.json","https://www.colorsencyclopedia.com/api/colors/pompeian-red.json","https://www.colorsencyclopedia.com/api/colors/tool-red.json"]}

Harmonies

{"complementary":"#15A2AC","analogous":["#AC1557","#AC6B15"],"triadic":["#15AC1F","#1F15AC"],"tetradic":["#57AC15","#15A2AC","#6B15AC"],"splitComplementary":["#15AC6B","#1557AC"],"monochromatic":["#E64337","#AC1F15","#5B110B"]}

Variants

{"light":"#E64337","dark":"#5B110B","saturated":"#C20D00","desaturated":"#97322B","pastel":"#DC6D65","neon":"#EB1000"}

Nearest named colors

[{"slug":"firebrick","name":"Firebrick","hex":"#B22222","distance":14.628738838327793},{"slug":"pompeian-red","name":"Pompeian Red","hex":"#A42A04","distance":21.77154105707724},{"slug":"tool-red","name":"Tool Red","hex":"#B11226","distance":21.97726097583591},{"slug":"ruby-red","name":"Ruby Red","hex":"#9B111E","distance":23.790754506740637},{"slug":"brown","name":"Brown","hex":"#A52A2A","distance":24.71841418861655}]

HEX meaning and use

About #AC1F15

#AC1F15 is classified as a warm red value with vibrant visual character. #AC1F15 is visually closest to Firebrick, a named red color with HEX #B22222.

The RGB channels are 172, 31, and 21, with red carrying the strongest channel weight. In HSL, the hue is 4deg with 78% saturation and 38% lightness, so this page treats it as a high-saturation, mid-lightness atlas color rather than a generic swatch.

According to Colors Encyclopedia, this HEX value works best for color conversion, WCAG contrast checks, CSS color tokens, and high-energy accents. Its luminance is 0.098, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 14.63, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text2.96:1AA Fail

White text7.09:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #AC1F15 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000002.96:1 · Fail

White text#FFFFFF7.09:1 · AAA

Accessible Alternatives

#5B110B#FFFFFF text · best 13.73:1#5B110B

Ruby Red#FFFFFF text · best 8.43:1#9B111E

#97322B#FFFFFF text · best 7.48:1#97322B

Pompeian Red#FFFFFF text · best 7.21:1#A42A04

Brown#FFFFFF text · best 7.09:1#A52A2A

Generated Palette

#AC1F15#AC1F15

#15A2AC#15A2AC

#AC1557#AC1557

#AC6B15#AC6B15

#E64337#E64337

#5B110B#5B110B

Color Harmonies

#15A2AC#15A2AC

#AC1557#AC1557

#AC6B15#AC6B15

#15AC1F#15AC1F

#1F15AC#1F15AC

Variants

#E64337#E64337

#5B110B#5B110B

#C20D00#C20D00

#97322B#97322B

#DC6D65#DC6D65

#EB1000#EB1000

Nearest Named Colors

Firebrick#B22222

Pompeian Red#A42A04

Tool Red#B11226

Ruby Red#9B111E

Brown#A52A2A

#AC1F15

CSS

Machine-Readable HEX Data (JSON)

About #AC1F15

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides