Necron Compound vs Green Pearl

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Green Pearl is a little lighter, more saturated than Necron Compound.

Can I use Green Pearl instead of Necron Compound?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Green Pearl is a little lighter, more saturated than Necron Compound.

Can I use Necron Compound instead of Green Pearl?

The same difference applies the other way round: Necron Compound is a little darker, 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.