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.
White Dove reflects far more light (LRV 83 vs 26), opening up a space where RAL 640-1 encloses it.
At LRV 52 vs 26, Purbeck Stone is decisively the brighter choice.
A 5-point LRV gap (30 vs 26) makes Evergreen Fog the marginally brighter of the two.
At LRV 60 vs 26, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 26), opening up a space where RAL 640-1 encloses it.
With LRVs of 27 and 26, the two reflect almost the same amount of light.
At LRV 43 vs 26, French Gray is decisively the brighter choice.
Tranquil Dawn reflects far more light (LRV 55 vs 26), opening up a space where RAL 640-1 encloses it.
Hardwick White reflects far more light (LRV 44 vs 26), opening up a space where RAL 640-1 encloses it.
At LRV 84 vs 26, Pure White is decisively the brighter choice.
Balboa Mist reflects far more light (LRV 66 vs 26), opening up a space where RAL 640-1 encloses it.
Shoji White reflects far more light (LRV 74 vs 26), opening up a space where RAL 640-1 encloses it.
RAL 640-1 reflects far more light (LRV 26 vs 12), opening up a space where Pewter Green encloses it.
RAL 640-1 reflects far more light (LRV 26 vs 8), opening up a space where Duck Green encloses it.
Skimming Stone reflects far more light (LRV 68 vs 26), opening up a space where RAL 640-1 encloses it.
RAL 640-1 reflects far more light (LRV 26 vs 12), opening up a space where Vintage Vogue encloses it.
Saybrook Sage reflects far more light (LRV 45 vs 26), opening up a space where RAL 640-1 encloses it.
A 6-point LRV gap (31 vs 26) makes Pale Green the marginally brighter of the two.