What color is #B3400A?

#B3400A is a dark, vivid red-orange. In RGB it is rgb(179, 64, 10), and in HSL hsl(19, 89%, 37%).

Is #B3400A accessible as text?

On white, #B3400A has a contrast ratio of 5.75:1 (passes WCAG AA for body text); on black it is 3.65:1 (fails). For text placed on #B3400A, use white for the best readability.

What is the closest Tailwind color to #B3400A?

The nearest Tailwind CSS token is amber-700 (#BB4D00).

What colors go well with #B3400A?

#B3400A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #0A7DB2. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #B3400A below.

Is #B3400A good for buttons?

#B3400A works well for buttons and highlights, but use white text on #B3400A — black text only reaches 3.65:1, below the 4.5:1 needed for normal-size labels.

Is #B3400A the same as CSS sienna?

No — #B3400A is not the CSS named color sienna, but sienna (#A0522D) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#B3400A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #B3400A

Not just a swatch — here's how #B3400A works with other colors. Named schemes with #B3400A in its natural role, and a note on why the supporting colors balance it.

Warm Autumn Interior Dominant · 5 colors

Dominant #B3400A Secondary #B66422 Accent #767843 Surface #F4ECDD Anchor #3B2A20

This palette keeps Rust as the dominant warm neutral, balanced by muted terracotta and olive earth tones and grounded by a deep espresso anchor.

Modern Café Dominant · 5 colors

Dominant #B3400A Anchor #3A2A20 Surface #F0E3D0 Accent #959765 Secondary #3B3833

Rust anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Vintage Leather Lead · 5 colors

Lead #B3400A Secondary #7B4926 Surface #EAD9C0 Accent #42503B Anchor #5B222D

Rust plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Berry & Cream Lead · 5 colors

Lead #B3400A Surface #F3E7D6 Anchor #5F2035 Accent #E6C2C1 Secondary #332B2D

Rust sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #B3400A Secondary #B3897B Support #9B9186 Ink #17140F

Rust is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Rust carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #B3400A actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 97/100

Warm

Reads warm and advancing — inviting, energetic, draws the eye forward.

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 49/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 83/100

Very high

Organic, earthy character — at home in wellness, food and craft brands.

Vintage feel 59/100

Moderate

Faded, nostalgic quality — editorial, heritage and retro work.

Luxury 52/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 43/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 99/100

Very high

Strong interactive accent — visible and can carry a legible label.

Surface fit 10/100

Very low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 82/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #B3400A

For UI

For branding

For interior

For fashion

People also use #B3400A with

Crimson Brass Teal Blue Greige Taupe

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 5.7:1. Use

Subtle surface Use #F3D7CA for cards and hover fills. Tint 80

Avoid beside #B2780A — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #B3400A at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #B3400A;
  --color-base-rgb: 179 64 10;
  --color-base-oklch: oklch(52.7% 0.160 40.2);
  --color-50: #FEF5F0;
  --color-100: #FDE4D8;
  --color-200: #FAC9B2;
  --color-300: #F1A37E;
  --color-400: #E37E4F;
  --color-500: #C95E2C;
  --color-600: #984D2A;
  --color-700: #6B3A23;
  --color-800: #46291B;
  --color-900: #2B1A13;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  rust: {
    50: '#FEF5F0',
    100: '#FDE4D8',
    200: '#FAC9B2',
    300: '#F1A37E',
    400: '#E37E4F',
    500: '#C95E2C',
    600: '#984D2A',
    700: '#6B3A23',
    800: '#46291B',
    900: '#2B1A13',
  },
}

$base: #B3400A;
$base-ink: #FFFFFF;
$base-50: #FEF5F0;
$base-100: #FDE4D8;
$base-200: #FAC9B2;
$base-300: #F1A37E;
$base-400: #E37E4F;
$base-500: #C95E2C;
$base-600: #984D2A;
$base-700: #6B3A23;
$base-800: #46291B;
$base-900: #2B1A13;
$base-hover: #8F3308;
$base-subtle: #EFC3AE;

{
    "color": {
        "base": {
            "value": "#B3400A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#FEF5F0",
                "type": "color"
            },
            "100": {
                "value": "#FDE4D8",
                "type": "color"
            },
            "200": {
                "value": "#FAC9B2",
                "type": "color"
            },
            "300": {
                "value": "#F1A37E",
                "type": "color"
            },
            "400": {
                "value": "#E37E4F",
                "type": "color"
            },
            "500": {
                "value": "#C95E2C",
                "type": "color"
            },
            "600": {
                "value": "#984D2A",
                "type": "color"
            },
            "700": {
                "value": "#6B3A23",
                "type": "color"
            },
            "800": {
                "value": "#46291B",
                "type": "color"
            },
            "900": {
                "value": "#2B1A13",
                "type": "color"
            }
        }
    }
}

Palettes built on #B3400A

Color Lab

Pairs with #B3400A

UI roles & guardrails

In real applications

Scales

Every model

Export