Thornwood Green vs Grey RLM02

How close are they?

ΔE 8.8, close: similar, with a visible difference side by side. Grey RLM02 is a little lighter, more muted, cooler than Thornwood Green.

Can I use Grey RLM02 instead of Thornwood Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Grey RLM02 is a little lighter, more muted, cooler than Thornwood Green.

Can I use Thornwood Green instead of Grey RLM02?

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