How does Fathom blue (No.18 C 39) by BS 4800 compare with Dulux’s closest paints? The nearest match is Dulux Mysterious Teal (ΔE 2.6, “near-identical”). 1 more Dulux colour sit within ΔE 4 — close enough that the difference is hard to spot once paint’s on the wall. These 3 Dulux paints are all priced at £14.40 per litre.
BS 4800 Fathom blue vs Dulux
Now inside your AI toolConnect free →3 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 |
|---|---|---|---|---|---|
| Mysterious Teal | — | 2.6 | near-identical | £14.40 | £2.22 |
| Teal Lux | — | 3.0 | very close | £14.40 | £2.22 |
| Sea Holly | — | 4.1 | very close | £14.40 | £2.22 |
Compare Fathom blue with another brand
Full BS 4800 → Dulux conversion chart — every colour's nearest equivalent