No shortage of substitutes here, Thousand Sons Blue from Citadel matches at 87 percent and 4 brands carry a strong same-finish near-match. Sea Blue is a dark vivid blue with a cool undertone. Within the Humbrol range it ladders cleanly, Tarmac for the shadows and WW1 Blue for the highlights. Bottom line: run out mid-project and another brand will get you within a shade.
Sea Blue equivalents in other ranges
Sea Blue is awkward to replace. Treat the matches below as starting points for a mix rather than straight swaps.
Closest Citadel equivalent: Citadel Thousand Sons Blue, a near match with visible drift up close (delta E 2.6).
The Army Painter's closest color: The Army Painter Abyssal Blue, close, with a hint of drift side by side (delta E 3.5).
Nearest in the Revell catalog: Revell Grünblau (RAL 5001), a near match with visible drift up close (delta E 3.5).
Best Scale75 option: Scale75 Cantabric Blue, close, with a hint of drift side by side (delta E 3.8).
The drift here is spread thinly across hue, lightness and saturation rather than leaning one way, so the mismatch reads as a general haze at delta E 2.6 rather than an obvious shift.
How to read the score
90+Close
80sUsable
<70Mix
Citadel
The Army Painter
Revell
Scale75
Vallejo
P3 Paints
Monument Pro Acryl
AK Interactive
Green Stuff World
Two Thin Coats
Tamiya
About this color
Color profile
Highlight and shade ladder
Pairs well with
Try any paint in the scheme toolMatch difficulty
Found in 4 other brands with a same-finish match.
Where painters use it
Frequently asked
What is the closest equivalent to Humbrol Sea Blue?
The closest same-finish match is Citadel Thousand Sons Blue at 87% color similarity.
What color is Sea Blue?
Sea Blue is a dark vivid blue with a cool undertone (hex #004B6E).