Ultramarine Blue vs Tyran Blue

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Tyran Blue is a little lighter than Ultramarine Blue. They are different kinds of paint: AMMO by Mig Ultramarine Blue is an opaque base/layer paint and Citadel Tyran Blue is a wash/shade, so they won’t behave the same on the model even where the colour is close.

Can I use Tyran Blue instead of Ultramarine Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Tyran Blue is a little lighter than Ultramarine Blue. They are different kinds of paint.

Can I use Ultramarine Blue instead of Tyran Blue?

The same difference applies the other way round: Ultramarine Blue is a little darker.

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.