RAL 840-3 vs Viaduct
Where RAL 840-3 belongs to RAL Effect's range, Viaduct is a Sherwin-Williams color. These are both greige-greys, so the question isn't which hue to choose — it's where within greige-grey to land. Viaduct (LRV 50) reflects noticeably more light than RAL 840-3 (LRV 46), a difference of 5 points that becomes especially apparent in rooms with limited natural light. At ΔE 2.9, these are close — the kind of difference that matters when choosing between them, but doesn't read strongly in a finished room. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
RAL 840-3 vs Viaduct Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 840-3 on one side and Viaduct 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 840-3 comparisons
See how RAL 840-3 stacks up against other well-photographed colors across different brands and tones.
