Pure Green vs Ferocious Green

How close are they?

ΔE 8.3, close: similar, with a visible difference side by side. Ferocious Green is a little lighter, more muted than Pure Green.

Can I use Ferocious Green instead of Pure Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Ferocious Green is a little lighter, more muted than Pure Green.

Can I use Pure Green instead of Ferocious Green?

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