Ultramarine Blue vs Shalaxi Violet

How close are they?

ΔE 11.4, fair: the same colour family, but not a straight swap. Shalaxi Violet is a little darker, warmer than Ultramarine Blue.

Can I use Shalaxi Violet instead of Ultramarine Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Shalaxi Violet is a little darker, warmer than Ultramarine Blue.

Can I use Ultramarine Blue instead of Shalaxi Violet?

The same difference applies the other way round: Ultramarine Blue is a little lighter, cooler.

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.