RAL 740-4 vs Ionian
RAL 740-4 is a RAL Effect color while Ionian comes from Sherwin-Williams. RAL 740-4 reads as blue-green, while Ionian reads as blue — two distinct hue families, not close cousins. At LRV 20 vs 17, Ionian will read as the brighter of the two — a 3-point gap that matters most in north-facing or low-light rooms. At ΔE 6.1, the difference is perceptible but not dramatic — the two can work harmoniously in the same space. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
RAL 740-4 vs Ionian in Real Spaces
1 real room side by side. RAL 740-4 and Ionian are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
Color Details
RAL 740-4 vs Ionian Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 740-4 on one side and Ionian 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 740-4 comparisons
See how RAL 740-4 stacks up against other well-photographed colors across different brands and tones.
