Medium Blue vs Ulthuan Grey

How close are they?

ΔE 12.1, fair: the same colour family, but not a straight swap. Ulthuan Grey is a little darker, more muted than Medium Blue.

Can I use Ulthuan Grey instead of Medium Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Ulthuan Grey is a little darker, more muted than Medium Blue.

Can I use Medium Blue instead of Ulthuan Grey?

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

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.