How does Signal yellow (No.1003) by RAL Classic compare with Johnstone's’s closest paints? The nearest match by perceptual distance is Johnstone's Yellow Diamond (ΔE 1.6, “near-identical”). 1 more Johnstone's colour sit within ΔE 4 — close enough that the difference is hard to spot once paint’s on the wall. Prices for these 3 Johnstone's paints range from £6.14 to £12.36 per litre.
RAL Classic Signal yellow vs Johnstone's
3 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 |
|---|---|---|---|---|---|
| Yellow Diamond | — | 1.6 | near-identical | £6.14 | £1.02 |
| Burning Gold | — | 3.0 | very close | £12.36 | £2.06 |
| Flirtatious | — | 4.1 | very close | £12.36 | £2.06 |