Palettes / Colors / #AC331B

#AC331B — Red

#AC331B is a red color we call Red, closest to the named color Brown (#A52A2A). It belongs to the red family.

Color name

Closest CSS keyword: brown (#A52A2A) — not an exact match. CSS brown gives you #A52A2A, a different color; use #AC331B when you need this exact shade.

Sources: common names follow widely used color-name references; CSS keywords and their hex values follow the CSS Color specification.

#AC331B is a warm red color associated with energy, passion and urgency. It is saturated enough to be the accent — buttons, highlights and calls to action — while neutrals do the quiet work around it.

Its strongest partner is its complement #1B94AC; it also sits naturally between #AC1B4B and #AC7C1B. In the palettes below you can see it working alongside real color combinations from our collection.

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Color values

RGB & CMYK percentages

Red 67% · Green 20% · Blue 11%

Cyan 0% · Magenta 70% · Yellow 84% · Key 33%

CMYK values are unprofiled approximations for screen reference — not a print-proofing guarantee.

Previews

CSS code for #AC331B

.text { color: #AC331B; }
.background { background-color: #AC331B; }
.border { border: 3px solid #AC331B; }
.text-rgb { color: rgb(172, 51, 27); }
.text-hsl { color: hsl(10, 73%, 39%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #AC331B; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(172, 51, 27, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #AC331B; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(172, 51, 27, 0.8); }

HTML: <p style="color:#AC331B">Text here</p> · <div style="background-color:#AC331B">Div content here</div>

Shades of #AC331B

Tints of #AC331B

Tones of #AC331B

Color harmonies

Complementary — #1B94AC:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #AC331B: #FFFFFF.

Semi-transparent (opacity) text on #AC331B

Text set with opacity blends into the background, so its real contrast is lower than the solid ratios above. Choose a text color and an opacity to see the blended color and its true ratio:

How #AC331B looks with color blindness

Simulated with standard Machado color-vision-deficiency matrices — useful when this color carries meaning in charts, maps or interfaces:

Closest design-system colors

The nearest matches in the Tailwind CSS, Material Design and Bootstrap palettes — handy when you need a framework class instead of a raw hex:

Palettes with a similar color

These palettes use a close neighbour of #AC331B rather than the exact color:

Similar colors

The closest colors that actually appear in our palette collection — click any to open its page:

Browse neighbouring colors

← #AC331A  ·  #AC331C →

Frequently asked questions

What color is #AC331B?

#AC331B is Red, a red color (RGB 172, 51, 27). Its closest standard named color is Brown.

What is the RGB and HSL of #AC331B?

#AC331B is RGB 172, 51, 27 — HSL 10°, 73%, 39% — CMYK 0%, 70%, 84%, 33%.

What colors go with #AC331B?

Its complement is #1B94AC; analogous partners are #AC1B4B and #AC7C1B. It also appears in 6+ palettes in our collection.

Can I use #AC331B for text?

White text on #AC331B has a contrast ratio of 6.47:1 (passes WCAG AA); black text gives 3.24:1.