RAL 740-4 vs Thames Fog
RAL 740-4 is a RAL Effect color while Thames Fog comes from Valspar. Hue-wise, RAL 740-4 belongs to the blue-green family and Thames Fog to the grey family. At LRV 27 vs 17, Thames Fog will read as the brighter of the two — a 11-point gap that matters most in north-facing or low-light rooms. At ΔE 22.8, these are genuinely distinct colors — a strong contrast if used together, or a meaningful choice between two different directions. Below you'll find 3 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
RAL 740-4 vs Thames Fog in Real Spaces
3 real rooms side by side. Seeing RAL 740-4 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
Living rooms test a color across a full range of conditions — morning sun, afternoon shade, and evening lamp light all shift how both of these read. Thames Fog returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Bathroom
Bathrooms amplify color — the enclosed space and reflective surfaces make what reads subtle elsewhere feel more present here. The LRV gap is large enough that Thames Fog will make the room feel meaningfully brighter than RAL 740-4 would.
Kitchen Cabinets
On cabinetry, undertone and temperature become more pronounced against countertops and hardware. The LRV gap is large enough that Thames Fog will make the room feel meaningfully brighter than RAL 740-4 would.
Color Details
RAL 740-4 vs Thames Fog Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 740-4 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 RAL 740-4 comparisons
See how RAL 740-4 stacks up against other well-photographed colors across different brands and tones.
