Iron Mountain vs Pewter Green
Where Iron Mountain belongs to Behr's range, Pewter Green is a Sherwin-Williams color. Iron Mountain reads as grey, while Pewter Green reads as green-grey — two distinct hue families, not close cousins. Iron Mountain (LRV 18) reflects noticeably more light than Pewter Green (LRV 12), a difference of 6 points that becomes especially apparent in rooms with limited natural light. Iron Mountain runs yellow while Pewter Green is decidedly neutral, which means they'll respond very differently to warm vs cool light sources. The ΔE 9.7 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Iron Mountain vs Pewter Green in Real Spaces
1 real room side by side. Iron Mountain and Pewter Green are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
Living Room
In a living room, color works across both daylight and evening light — the same wall can read very differently at noon and at 8pm. The brightness difference is modest but present — Iron Mountain gives the walls a little more lift.
Color Details
Iron Mountain vs Pewter Green Simulated Comparison
5 simulated room previews — drag the slider on each to see Iron Mountain on one side and Pewter 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 Iron Mountain comparisons
See how Iron Mountain stacks up against other well-photographed colors across different brands and tones.
