Old Mill Blue vs RAL 580-M
Old Mill Blue is a PPG color while RAL 580-M comes from RAL Effect. Old Mill Blue reads as blue-grey, while RAL 580-M reads as blue — two distinct hue families, not close cousins. With LRVs of 17 and 15, they'll behave almost identically in terms of how much light they reflect back into a room. At ΔE 5.2, 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
Old Mill Blue vs RAL 580-M Simulated Comparison
5 simulated room previews — drag the slider on each to see Old Mill Blue on one side and RAL 580-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 Old Mill Blue comparisons
See how Old Mill Blue stacks up against other well-photographed colors across different brands and tones.
