Match RAL 640-6
RAL Effect RAL 640-6 is a deep, low-reflectance shade with an LRV of 5. The matches below are ranked by ΔE, a perceptual color-difference score.
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Closest matches across every brand
One match per brand, ranked by ΔE — a perceptual color difference score calculated from Lab color space values. Lower is closer. Click any card to compare side by side in simulated rooms.
Gentian blue reads slightly lighter (LRV 9 vs 5), a gap that shows most in low-lit rooms. At ΔE 0.7 you'd need them side by side to tell them apart.
California Blue reads slightly lighter (LRV 10 vs 5), a gap that shows most in low-lit rooms. At ΔE 1.8 you'd need them side by side to tell them apart.
A 4-point LRV gap (9 vs 5) makes Cobalt Embrace the marginally brighter of the two. The ΔE 3.3 gap is real but not dramatic — distinct as a choice, harmonious together.
Stunning Sapphire reads slightly lighter (LRV 9 vs 5), a gap that shows most in low-lit rooms. At ΔE 3.9 they're clearly different, yet close enough to share a room.
Their light reflectance is nearly identical (LRV 6 vs 5), so neither reads brighter in a room. The ΔE 4.5 gap is real but not dramatic — distinct as a choice, harmonious together.
Their light reflectance is nearly identical (LRV 7 vs 5), so neither reads brighter in a room. The ΔE 6.1 gap is real but not dramatic — distinct as a choice, harmonious together.
Their light reflectance is nearly identical (LRV 8 vs 5), so neither reads brighter in a room. The ΔE 8.6 gap is real but not dramatic — distinct as a choice, harmonious together.
With LRVs of 8 and 5, the two reflect almost the same amount of light. At ΔE 15.2 these are two genuinely different directions, not variations on a theme.
A 10-point LRV gap (15 vs 5) makes Pitch Blue the marginally brighter of the two. A ΔE of 19.3 puts them firmly in different territory — a strong contrast if combined.
Passageway reads slightly lighter (LRV 14 vs 5), a gap that shows most in low-lit rooms. At ΔE 26.5 these are two genuinely different directions, not variations on a theme.
With LRVs of 5 and 4, the two reflect almost the same amount of light. At ΔE 28.1 these are two genuinely different directions, not variations on a theme.