Deep Azure vs Phthalo Green

How close are they?

ΔE 14.4, fair: the same colour family, but not a straight swap. Phthalo Green is a little lighter, warmer than Deep Azure.

Can I use Phthalo Green instead of Deep Azure?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Phthalo Green is a little lighter, warmer than Deep Azure.

Can I use Deep Azure instead of Phthalo Green?

The same difference applies the other way round: Deep Azure is a little darker, 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.