RAL 640-1 vs K431
Where RAL 640-1 belongs to RAL Effect's range, K431 is a Tikkurila color. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. RAL 640-1 (LRV 26) reflects noticeably more light than K431 (LRV 18), a difference of 8 points that becomes especially apparent in rooms with limited natural light. With a ΔE of 18.0, 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
RAL 640-1 vs K431 Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 640-1 on one side and K431 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 640-1 comparisons
See how RAL 640-1 stacks up against other well-photographed colors across different brands and tones.
