Naggaroth Night vs Phthalo Cyanine Blue

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Phthalo Cyanine Blue is more muted, cooler than Naggaroth Night.

Can I use Phthalo Cyanine Blue instead of Naggaroth Night?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Phthalo Cyanine Blue is more muted, cooler than Naggaroth Night.

Can I use Naggaroth Night instead of Phthalo Cyanine Blue?

The same difference applies the other way round: Naggaroth Night is more saturated, 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.