Ultramarine Blue vs Regal Blue

How close are they?

ΔE 14.9, fair: the same colour family, but not a straight swap. Regal Blue is much more saturated than Ultramarine Blue.

✓ Herrick Games paint comparison chart lists these two as equivalents.

Can I use Regal Blue instead of Ultramarine Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Regal Blue is much more saturated than Ultramarine Blue.

Can I use Ultramarine Blue instead of Regal Blue?

The same difference applies the other way round: Ultramarine Blue is much more muted.

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.