Spectral Blue vs Jade Green

How close are they?

ΔE 17.3, loose: different enough that you should pick on purpose. Jade Green is a little lighter, much more saturated, warmer than Spectral Blue.

Can I use Jade Green instead of Spectral Blue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Jade Green is a little lighter, much more saturated, warmer than Spectral Blue.

Can I use Spectral Blue instead of Jade Green?

The same difference applies the other way round: Spectral Blue is a little darker, much more muted, 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.