About this combination
Combination 33 of 348 in Wada's six-volume 1933 work. A two-colour pairing of Raw Sienna, Slate Color, as documented in the original plates.
Historical context
Plate 33 of Wada's 348 anchors Raw Sienna and Slate Color in the orange family — a 2-colour grouping with a solemn, warm, 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 — Raw Sienna on Slate Color — reaches a contrast ratio of 2.62:1, below the WCAG text-contrast floor, so it reads best in decorative blocks rather than text pairings.