Hexos Palesun vs Septic Green

How close are they?

ΔE 25.1, loose: different enough that you should pick on purpose. Septic Green is noticeably darker, much more saturated than Hexos Palesun.

Can I use Septic Green instead of Hexos Palesun?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Septic Green is noticeably darker, much more saturated than Hexos Palesun.

Can I use Hexos Palesun instead of Septic Green?

The same difference applies the other way round: Hexos Palesun is noticeably lighter, much more muted.

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.