Matt Marine Blue vs Runic Cobalt

How close are they?

ΔE 9.4, close: similar, with a visible difference side by side. Runic Cobalt is a little darker, more muted, cooler than Matt Marine Blue. They are different kinds of paint: AMMO by Mig Matt Marine Blue is an ink, glaze or transparent paint and Army Painter Runic Cobalt is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.

Can I use Runic Cobalt instead of Matt Marine Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Runic Cobalt is a little darker, more muted, cooler than Matt Marine Blue. They are different kinds of paint.

Can I use Matt Marine Blue instead of Runic Cobalt?

The same difference applies the other way round: Matt Marine Blue is a little lighter, more saturated, warmer.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.