Match RAL 640-4
RAL Effect RAL 640-4 is a deep, low-reflectance shade with an LRV of 7. 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.
Traffic blue reads slightly lighter (LRV 11 vs 7), a gap that shows most in low-lit rooms. At ΔE 0.9 you'd need them side by side to tell them apart.
With LRVs of 9 and 7, the two reflect almost the same amount of light. At ΔE 2.8 you'd need them side by side to tell them apart.
Their light reflectance is nearly identical (LRV 9 vs 7), so neither reads brighter in a room. The ΔE 5.6 gap is real but not dramatic — distinct as a choice, harmonious together.
A 3-point LRV gap (10 vs 7) makes Cosmic Cobalt the marginally brighter of the two. The ΔE 5.7 gap is real but not dramatic — distinct as a choice, harmonious together.
Their light reflectance is nearly identical (LRV 9 vs 7), so neither reads brighter in a room. The ΔE 6.9 gap is real but not dramatic — distinct as a choice, harmonious together.
With LRVs of 8 and 7, the two reflect almost the same amount of light. At ΔE 17.0 these are two genuinely different directions, not variations on a theme.
A 9-point LRV gap (15 vs 7) makes Pitch Blue the marginally brighter of the two. A ΔE of 17.7 puts them firmly in different territory — a strong contrast if combined.
Passageway reads slightly lighter (LRV 14 vs 7), a gap that shows most in low-lit rooms. At ΔE 25.6 these are two genuinely different directions, not variations on a theme.
S 5010-R90B reflects far more light (LRV 19 vs 7), opening up a space where RAL 640-4 encloses it. At ΔE 30.0 these are two genuinely different directions, not variations on a theme.