Steely Blue vs Ultramarine Shadow

How close are they?

ΔE 5.7, very close: most people won’t see a difference side by side. Ultramarine Shadow is more saturated, cooler than Steely Blue.

Can I use Ultramarine Shadow instead of Steely Blue?

Yes, for most jobs. Very close match (ΔE 6). Ultramarine Shadow is more saturated, cooler than Steely Blue.

Can I use Steely Blue instead of Ultramarine Shadow?

The same difference applies the other way round: Steely Blue is more muted, warmer.

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.