Municipal

What was measured

Closest neighbours

ΔE00 19.3

how alike two adjacent swatches look

Darkest to lightest

5.49:1

WCAG contrast across the set

Lightness covered

65 pts

of OKLCH lightness, 0–100

Under colour blindness

ΔE00 7.5

worst under tritanopia

These two are one colour to a reader with tritanopia. Fine while the set is read as an order; never use them to mean two different things without a label or an icon as well.

Five colours are not an interface, so this is an offer rather than a token set. It clears WCAG AA as it stands.

/* Municipal — Public-service forms: a civic blue, a confirmation green, a clean sheet. */
:root {
  --palette-1: #003440;
  --palette-2: #066f85;
  --palette-3: #f7f0da;
  --palette-4: #293b27;
  --palette-5: #98ab96;

  /* A suggested mapping, not a token set. It clears WCAG AA as it stands. */
  --bg: #f7f0da;
  --text: #003440;        /* 11.78:1 on --bg */
  --muted: #066f85;      /* 5.09:1 on --bg */
  --accent: #066f85;     /* 5.09:1 on --bg */
  --accent-text: #ffffff;
}

// tailwind.config — Municipal
export default {
  theme: {
    extend: {
      colors: {
        municipal: {
        100: "#003440",
        200: "#066f85",
        300: "#f7f0da",
        400: "#293b27",
        500: "#98ab96",
        },
      },
    },
  },
};

Use the Municipal palette: #003440, #066F85, #F7F0DA, #293B27, #98AB96.

It is for this: Public-service forms: a civic blue, a confirmation green, a clean sheet.

Map it as ground #F7F0DA, body text #003440, secondary text #066F85, and one accent #066F85 with #FFFFFF printed on it. Body text measures 11.78:1 against the ground and secondary text 5.09:1, so this mapping clears WCAG AA as it stands.

Do not use it for: Playful products — this palette has a queue and a ticket number.

Do not add a sixth colour, do not tint the greys toward a second hue, and do not carry meaning on hue alone — once colour vision is taken away the closest two of these sit only 7.5 apart on the CIEDE2000 scale, which is too close to tell apart, so pair every coloured state with a label or an icon.

How this palette was built · no hex was chosen by hand

The catalog states a recipe — scene from hue 218 and 142 — and the five colours are derived from it in OKLCH, where a step of lightness is a step your eye agrees with rather than one the hex numbers agree with. That is why the numbers above are properties of this palette rather than claims about it.

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