Ionian vs Surf Green

Ionian and Surf Green come from the same Sherwin-Williams collection. Ionian reads as blue, while Surf Green reads as blue-green — two distinct hue families, not close cousins. Their light reflectance values are nearly the same — 20 vs 21 — so neither will read significantly brighter or darker than the other. Both share a cool character, which means they'll respond to light and surrounding materials in similar ways. A ΔE of 13.4 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.