Warm Yellow vs Demigod Flames

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. Demigod Flames is more saturated than Warm Yellow.

Can I use Demigod Flames instead of Warm Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Demigod Flames is more saturated than Warm Yellow.

Can I use Warm Yellow instead of Demigod Flames?

The same difference applies the other way round: Warm Yellow is more muted.

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.