Haishoku Sōkan B-hen — September (長月) no. 4

• ground
  Dull Violet Black— (no Japanese name in data) #091f44oklch(24.6% 0.075 260.2)rgb(9, 31, 68)
• type
  Sulphine Yellow黄檗色 #c19f2coklch(71.4% 0.132 91.5)rgb(193, 159, 44)
• accent
  Blue青色 #006eb8oklch(52.6% 0.143 248.3)rgb(0, 110, 184)

Highest-contrast pair: Sulphine Yellow on Dull Violet Black, 6.40:1 (passes WCAG AA for body text).

/* Sanzo Wada — Haishoku Sōkan B-hen — September (長月) no. 4 */
:root {
  --wada-sulphine-yellow: #c19f2c; /* oklch(71.4% 0.132 91.5) · 黄檗色 */
  --wada-blue: #006eb8; /* oklch(52.6% 0.143 248.3) · 青色 */
  --wada-dull-violet-black: #091f44; /* oklch(24.6% 0.075 260.2) */

  /* suggested roles */
  --ground: var(--wada-dull-violet-black);
  --type: var(--wada-sulphine-yellow);
  --accent: var(--wada-blue);
}

/* OKLCH variant */
:root {
  --wada-sulphine-yellow: oklch(71.4% 0.132 91.5);
  --wada-blue: oklch(52.6% 0.143 248.3);
  --wada-dull-violet-black: oklch(24.6% 0.075 260.2);
}

Source crosswalk: port number 52; authenticated modern page/plate and membership remain unresolved. Month assignment is verified against the pinned port helper, not the printed edition.

Download s52 JSON with IDs and provenance. Roles are suggestions computed from OKLCH chroma and contrast, not from Wada.