Mountain Pass vs Rookwood Sash Green
Both from Sherwin-Williams's palette. Hue-wise, Mountain Pass belongs to the blue-grey family and Rookwood Sash Green to the blue-green family. They have nearly identical light reflectance values (14 vs 13), so they'll read as similarly Dark in most lighting conditions. Mountain Pass runs neutral while Rookwood Sash Green is decidedly cool, which means they'll respond very differently to warm vs cool light sources. The ΔE 5.1 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.
Color Details
Mountain Pass vs Rookwood Sash Green Simulated Comparison
5 simulated room previews — drag the slider on each to see Mountain Pass on one side and Rookwood Sash Green on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Mountain Pass comparisons
See how Mountain Pass stacks up against other well-photographed colors across different brands and tones.
