Cyan vs Aegis Aqua

How close are they?

ΔE 13.0, fair: the same colour family, but not a straight swap. Aegis Aqua is noticeably darker, more saturated, cooler than Cyan.

Can I use Aegis Aqua instead of Cyan?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Aegis Aqua is noticeably darker, more saturated, cooler than Cyan.

Can I use Cyan instead of Aegis Aqua?

The same difference applies the other way round: Cyan is noticeably lighter, 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.