RAL 640-4 vs Jay Blue
Where RAL 640-4 belongs to RAL Effect's range, Jay Blue is a Sherwin-Williams color. These are both blues, so the question isn't which hue to choose — it's where within blue to land. Jay Blue (LRV 9) reflects noticeably more light than RAL 640-4 (LRV 7), a difference of 3 points that becomes especially apparent in rooms with limited natural light. The ΔE 4.1 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
RAL 640-4 vs Jay Blue in Real Spaces
1 real room side by side. RAL 640-4 and Jay Blue 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 640-4 vs Jay Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 640-4 on one side and Jay 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 RAL 640-4 comparisons
See how RAL 640-4 stacks up against other well-photographed colors across different brands and tones.
