Celestial Azure vs Hydra Turquoise

How close are they?

ΔE 10.9, fair: the same colour family, but not a straight swap. Hydra Turquoise is a little lighter, more muted than Celestial Azure.

Can I use Hydra Turquoise instead of Celestial Azure?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Hydra Turquoise is a little lighter, more muted than Celestial Azure.

Can I use Celestial Azure instead of Hydra Turquoise?

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

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.