Poseidon vs Thames Fog
Where Poseidon belongs to Sherwin-Williams's range, Thames Fog is a Valspar color. Hue-wise, Poseidon belongs to the blue family and Thames Fog to the grey family. Thames Fog (LRV 27) reflects noticeably more light than Poseidon (LRV 11), a difference of 16 points that becomes especially apparent in rooms with limited natural light. With a ΔE of 33.5, 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.
Poseidon vs Thames Fog in Real Spaces
1 real room side by side. Seeing Poseidon 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.
Bathroom
Bathrooms are one of the few spaces where you're genuinely enclosed by the paint color, which makes the choice between these two more consequential. Thames Fog reflects noticeably more light off the walls, making the space read more open than Poseidon.
Color Details
Poseidon vs Thames Fog Simulated Comparison
5 simulated room previews — drag the slider on each to see Poseidon 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 Poseidon comparisons
See how Poseidon stacks up against other well-photographed colors across different brands and tones.
