RAL 820-4 vs Blue Hill
RAL 820-4 (RAL Effect) and Blue Hill (Sherwin-Williams) come from different manufacturers. Hue-wise, RAL 820-4 belongs to the blue-grey family and Blue Hill to the blue family. The NaN-point LRV gap — NaN for Blue Hill vs 23 for RAL 820-4 — means Blue Hill will open up a space more effectively. A ΔE of NaN puts these firmly in different territory — two distinct design choices rather than close alternatives. 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 820-4 vs Blue Hill Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 820-4 on one side and Blue Hill 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 820-4 comparisons
See how RAL 820-4 stacks up against other well-photographed colors across different brands and tones.
