Mountain Pass vs Thames Fog
Where Mountain Pass belongs to Sherwin-Williams's range, Thames Fog is a Valspar color. Hue-wise, Mountain Pass belongs to the blue-grey family and Thames Fog to the grey family. Thames Fog (LRV 27) reflects noticeably more light than Mountain Pass (LRV 14), a difference of 14 points that becomes especially apparent in rooms with limited natural light. With a ΔE of 18.3, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Mountain Pass vs Thames Fog in Real Spaces
1 real room side by side. Seeing Mountain Pass and Thames Fog in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
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 LRV gap is large enough that Thames Fog will make the room feel meaningfully brighter than Mountain Pass would.
Color Details
Mountain Pass vs Thames Fog Simulated Comparison
5 simulated room previews — drag the slider on each to see Mountain Pass on one side and Thames Fog 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.
