How does Water blue (No.5021) by RAL Classic compare with Dulux’s closest paints? The nearest match by perceptual distance is Dulux Hawaiian Blue 2 (ΔE 2.4, “near-identical”). 2 more Dulux colours sit within ΔE 4 — close enough that the difference is hard to spot once paint’s on the wall. These 5 Dulux paints are all priced at £10.20 per litre.
RAL Classic Water blue vs Dulux
5 closest Dulux matches 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 |
|---|---|---|---|---|---|
| Hawaiian Blue 2 | — | 2.4 | near-identical | £10.20 | £1.57 |
| Liberty Blue 1 | — | 3.7 | very close | £10.20 | £1.57 |
| Maldive Dream | — | 3.8 | very close | £10.20 | £1.57 |
| Hawaiian Blue 3 | — | 4.8 | very close | £10.20 | £1.57 |
| Azure Fusion 2 | — | 5.0 | close | £10.20 | £1.57 |