Cokum Copper vs Orange Ochre

How close are they?

ΔE 7.9, close: similar, with a visible difference side by side. Orange Ochre is more muted, cooler than Cokum Copper.

Can I use Orange Ochre instead of Cokum Copper?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Orange Ochre is more muted, cooler than Cokum Copper.

Can I use Cokum Copper instead of Orange Ochre?

The same difference applies the other way round: Cokum Copper is 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.