Pure Green vs Warp Lightning

How close are they?

ΔE 12.6, fair: the same colour family, but not a straight swap. Warp Lightning is a little darker, more muted than Pure Green. They are different kinds of paint: AMMO by Mig Pure Green is an opaque base/layer paint and Citadel Warp Lightning is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.

Can I use Warp Lightning instead of Pure Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Warp Lightning is a little darker, more muted than Pure Green. They are different kinds of paint.

Can I use Pure Green instead of Warp Lightning?

The same difference applies the other way round: Pure Green is a little lighter, more saturated.

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.