How does Celestial Blue 1 by Dulux compare with RAL Classic’s closest paints? The nearest match is RAL Classic Azure blue (ΔE 3.3, “very close”).
Dulux Celestial Blue 1 vs RAL Classic
1 closest RAL Classic match ranked by ΔE
ΔE (CIEDE2000) is a perceptual distance metric — lower means a closer match. Matches under ΔE 2 are typically indistinguishable; ΔE 2–4 looks “the same” once dry on a wall; ΔE 4–6 is noticeable side-by-side. Always view a sample pot before committing — screen colours and lighting vary.
| Colour | Number | ΔE | Match quality | Price/L | Price/m2 |
|---|---|---|---|---|---|
| Azure blue | No.5009 | 3.3 | very close | — | — |