Eye of Terror vs Flat Red

How close are they?

ΔE 13.5, fair: the same colour family, but not a straight swap. Flat Red is a little lighter, warmer than Eye of Terror.

Can I use Flat Red instead of Eye of Terror?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Flat Red is a little lighter, warmer than Eye of Terror.

Can I use Eye of Terror instead of Flat Red?

The same difference applies the other way round: Eye of Terror is a little darker, 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.