Medium Green vs Terminatus Stone

How close are they?

ΔE 8.7, close: similar, with a visible difference side by side. Terminatus Stone is more muted, warmer than Medium Green.

Can I use Terminatus Stone instead of Medium Green?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Terminatus Stone is more muted, warmer than Medium Green.

Can I use Medium Green instead of Terminatus Stone?

The same difference applies the other way round: Medium Green is more saturated, cooler.

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.