Lupercal Green vs Dark Jade

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Dark Jade is cooler than Lupercal Green.

Can I use Dark Jade instead of Lupercal Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dark Jade is cooler than Lupercal Green.

Can I use Lupercal Green instead of Dark Jade?

The same difference applies the other way round: Lupercal Green is 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.