Britannia Blue vs Eclipse

Both from Benjamin Moore's palette. Both sit in the blue-grey family, which is useful context if you're narrowing within a single hue direction. They have nearly identical light reflectance values (18 vs 20), so they'll read as similarly Dark in most lighting conditions. Both lean blue, so they'll behave similarly in mixed or changing light conditions. The ΔE 3.3 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.