Royal Regatta 4 vs Sea Blue
Royal Regatta 4 and Sea Blue are both Dulux blues. The gap between them is ΔE 4.1 — “very close”. Sea Blue is the lighter of the two. Both cost about £10.20 per litre.
| Royal Regatta 4 | Sea Blue | |
|---|---|---|
| Hex | #3F87BC | #588DC3 |
| Lightness (L*) | 54 | 57 |
| Price / litre | £10.20 | £10.20 |
More Dulux comparisons
Looking across brands instead? See Royal Regatta 4’s cross-brand matches and cheaper alternatives, or Sea Blue’s.