Dark Olive Drab 41 vs BS Dark Earth

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. BS Dark Earth is more saturated, warmer than Dark Olive Drab 41.

Can I use BS Dark Earth instead of Dark Olive Drab 41?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). BS Dark Earth is more saturated, warmer than Dark Olive Drab 41.

Can I use Dark Olive Drab 41 instead of BS Dark Earth?

The same difference applies the other way round: Dark Olive Drab 41 is more muted, 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.