Cobalt Stone vs Signal blue
Where Cobalt Stone belongs to PPG's range, Signal blue is a RAL Classic color. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. Cobalt Stone (LRV 14) reflects noticeably more light than Signal blue (LRV 10), a difference of 4 points that becomes especially apparent in rooms with limited natural light. With a ΔE of 14.5, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. 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 Signal blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Cobalt Stone on one side and Signal blue 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.
