What color is #210100?

#210100 is a very dark, vivid red. In RGB it is rgb(33, 1, 0), and in HSL hsl(2, 100%, 6%).

Is #210100 accessible as text?

On white, #210100 has a contrast ratio of 19.64:1 (passes WCAG AA for body text); on black it is 1.07:1 (fails). For text placed on #210100, use white for the best readability.

What is the closest Tailwind color to #210100?

The nearest Tailwind CSS token is taupe-950 (#0C0A09).

What colors go well with #210100?

#210100 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #001E1F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #210100 below.

Is #210100 good for buttons?

#210100 works well for buttons and highlights, but use white text on #210100 — black text only reaches 1.07:1, below the 4.5:1 needed for normal-size labels.

Is #210100 the same as CSS black?

No — #210100 is not the CSS named color black, but black (#000000) is the closest CSS named color.

#210100 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #210100

Not just a swatch — here's how #210100 works with other colors. Named schemes with #210100 in its natural role, and a note on why the supporting colors balance it.

Warm Autumn Interior Dominant · 5 colors

Dominant #210100 Secondary #B76324 Accent #777743 Surface #F4EBDD Anchor #3B2A20

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

Vintage Leather Lead · 5 colors

Lead #210100 Secondary #7B4927 Surface #EAD9C0 Accent #43503A Anchor #5A222E

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

Desert Clay Center · 5 colors

Center #210100 Surface #E3CEA8 Secondary #B17957 Accent #98976D Anchor #3E2C21

Jet Black holds the warm center of this desert palette with sand and clay beside it, a muted-sage accent and a dark-brown anchor.

Japanese Sand Base · 5 colors

Base #210100 Surface #F0E9DC Highlight #F7F1E7 Secondary #BBAEA0 Ink #2B2723

Jet Black sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #210100 Secondary #372A27 Support #9B9186 Ink #17140F

Jet Black 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 Jet Black carrying the quiet middle.

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Color Lab

How #210100 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 67/100

Warm

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

Softness 17/100

Very low

Firm and assertive — carries weight and contrast.

Depth 81/100

Very high

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 73/100

High

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

Vintage feel 35/100

Low

A faint retro warmth without tipping into sepia.

Luxury 82/100

Very high

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 24/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 7/100

Very low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 56/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 93/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #210100

For UI

For branding

For interior

For fashion

People also use #210100 with

Oxblood Graphite Gainsboro Espresso

UI roles & guardrails

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

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 19.6:1. Use

Subtle surface Use #F2AFAD for cards and hover fills. Tint 80

Avoid beside #1F0B00 — 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 #210100 at work across the surfaces designers actually ship.

Website / UI

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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: #210100;
  --color-base-rgb: 33 1 0;
  --color-base-oklch: oklch(15.8% 0.061 31.3);
  --color-50: #FEF1F0;
  --color-100: #FDD9D8;
  --color-200: #FCB3B1;
  --color-300: #F87B77;
  --color-400: #EC4C46;
  --color-500: #D22822;
  --color-600: #9F2723;
  --color-700: #70221F;
  --color-800: #481A18;
  --color-900: #2C1211;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#FEF1F0',
    100: '#FDD9D8',
    200: '#FCB3B1',
    300: '#F87B77',
    400: '#EC4C46',
    500: '#D22822',
    600: '#9F2723',
    700: '#70221F',
    800: '#481A18',
    900: '#2C1211',
  },
}

$base: #210100;
$base-ink: #FFFFFF;
$base-50: #FEF1F0;
$base-100: #FDD9D8;
$base-200: #FCB3B1;
$base-300: #F87B77;
$base-400: #EC4C46;
$base-500: #D22822;
$base-600: #9F2723;
$base-700: #70221F;
$base-800: #481A18;
$base-900: #2C1211;
$base-hover: #180100;
$base-subtle: #EE8480;

{
    "color": {
        "base": {
            "value": "#210100",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#FEF1F0",
                "type": "color"
            },
            "100": {
                "value": "#FDD9D8",
                "type": "color"
            },
            "200": {
                "value": "#FCB3B1",
                "type": "color"
            },
            "300": {
                "value": "#F87B77",
                "type": "color"
            },
            "400": {
                "value": "#EC4C46",
                "type": "color"
            },
            "500": {
                "value": "#D22822",
                "type": "color"
            },
            "600": {
                "value": "#9F2723",
                "type": "color"
            },
            "700": {
                "value": "#70221F",
                "type": "color"
            },
            "800": {
                "value": "#481A18",
                "type": "color"
            },
            "900": {
                "value": "#2C1211",
                "type": "color"
            }
        }
    }
}

Palettes built on #210100

Color Lab

Pairs with #210100

UI roles & guardrails

In real applications

Scales

Every model

Export