About this combination
Combination 65 of 348 in Wada's six-volume 1933 work. A two-colour pairing of Sulphine Yellow, Calamine BLue, as documented in the original plates.
Historical context
Plate 65 of Wada's 348 anchors Sulphine Yellow and Calamine BLue in the yellow family — a 2-colour grouping with a refined, cool, austere character, recorded in the Showa-era volumes of Sanzo Wada's 1933 Dictionary of Color Combinations, where these shikisai names have sat in the public domain for generations. Its strongest pairing — Sulphine Yellow on Calamine BLue — reaches a contrast ratio of 1.38:1, below the WCAG text-contrast floor, so it reads best in decorative blocks rather than text pairings.