Cobalt Stone vs RAL 640-M
Cobalt Stone is a PPG color while RAL 640-M comes from RAL Effect. These are both blues, so the question isn't which hue to choose — it's where within blue to land. At LRV 14 vs 5, Cobalt Stone will read as the brighter of the two — a 9-point gap that matters most in north-facing or low-light rooms. At ΔE 12.8, these are genuinely distinct colors — a strong contrast if used together, or a meaningful choice between two different directions. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Cobalt Stone vs RAL 640-M Simulated Comparison
5 simulated room previews — drag the slider on each to see Cobalt Stone on one side and RAL 640-M 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 Cobalt Stone comparisons
See how Cobalt Stone stacks up against other well-photographed colors across different brands and tones.
