Archangel Red vs Beherit Red

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Beherit Red is a little lighter, more muted than Archangel Red.

Can I use Beherit Red instead of Archangel Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Beherit Red is a little lighter, more muted than Archangel Red.

Can I use Archangel Red instead of Beherit Red?

The same difference applies the other way round: Archangel Red is a little darker, more saturated.

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.