RAL 660-4 vs Fountain
RAL 660-4 is a RAL Effect color while Fountain comes from Sherwin-Williams. These are both blues, so the question isn't which hue to choose — it's where within blue to land. At LRV 39 vs 31, Fountain will read as the brighter of the two — a 9-point gap that matters most in north-facing or low-light rooms. At ΔE 4.4, the difference is perceptible but not dramatic — the two can work harmoniously in the same space. 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 660-4 vs Fountain Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 660-4 on one side and Fountain 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 660-4 comparisons
See how RAL 660-4 stacks up against other well-photographed colors across different brands and tones.
