Flesh Tearers Red vs Martian Orange

How close are they?

ΔE 8.7, close: similar, with a visible difference side by side. Martian Orange is warmer than Flesh Tearers Red.

Can I use Martian Orange instead of Flesh Tearers Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Martian Orange is warmer than Flesh Tearers Red.

Can I use Flesh Tearers Red instead of Martian Orange?

The same difference applies the other way round: Flesh Tearers Red is 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.