Hydra Turquoise vs Phthalo Green

How close are they?

ΔE 12.1, fair: the same colour family, but not a straight swap. Phthalo Green is a little darker, warmer than Hydra Turquoise.

Can I use Phthalo Green instead of Hydra Turquoise?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Phthalo Green is a little darker, warmer than Hydra Turquoise.

Can I use Hydra Turquoise instead of Phthalo Green?

The same difference applies the other way round: Hydra Turquoise 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.