RAL 640-4 vs Thames Fog
RAL 640-4 is a RAL Effect color while Thames Fog comes from Valspar. Hue-wise, RAL 640-4 belongs to the blue family and Thames Fog to the grey family. At LRV 27 vs 7, Thames Fog will read as the brighter of the two — a 21-point gap that matters most in north-facing or low-light rooms. At ΔE 46.1, 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 640-4 vs Thames Fog in Real Spaces
3 real rooms side by side. Seeing RAL 640-4 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.
Bedroom
Bedroom walls are often seen under warm artificial light, a context that shifts both colors from how they look on a chip. The LRV gap is large enough that Thames Fog will make the room feel meaningfully brighter than RAL 640-4 would.
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 640-4 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 640-4 would.
Color Details
RAL 640-4 vs Thames Fog Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 640-4 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 640-4 comparisons
See how RAL 640-4 stacks up against other well-photographed colors across different brands and tones.
