Ultramarine Blue vs Altdorf Guard Blue

How close are they?

ΔE 3.6, very close: most people won’t see a difference side by side. Our swatches for the two are almost the same.

✓ Army Painter Fanatic conversion chart lists these two as equivalents.

Can I use Altdorf Guard Blue instead of Ultramarine Blue?

Yes, for most jobs. Very close match (ΔE 4). The swatches are almost the same.

Can I use Ultramarine Blue instead of Altdorf Guard Blue?

The same difference applies the other way round.

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.