How does Sky blue (No.5015) by RAL Classic compare with Johnstone's’s closest paints? The nearest match by perceptual distance is Johnstone's Nocturne Shade (ΔE 1.7, “near-identical”). 4 more Johnstone's colours sit within ΔE 4 — close enough that the difference is hard to spot once paint’s on the wall. These 6 Johnstone's paints are all priced at £12.36 per litre.
RAL Classic Sky blue vs Johnstone's
6 closest Johnstone's 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 |
|---|---|---|---|---|---|
| Nocturne Shade | — | 1.7 | near-identical | £12.36 | £2.06 |
| Planetarium | — | 2.6 | near-identical | £12.36 | £2.06 |
| Sapphire Sky | — | 3.6 | very close | £12.36 | £2.06 |
| Cobalt Glaze | — | 3.7 | very close | £12.36 | £2.06 |
| Cobalt Stone | — | 3.9 | very close | £12.36 | £2.06 |
| Cenote | — | 4.1 | very close | £12.36 | £2.06 |