Alizarin Crimson Hue vs Flat Red

How close are they?

ΔE 13.2, fair: the same colour family, but not a straight swap. Flat Red is noticeably lighter than Alizarin Crimson Hue.

Can I use Flat Red instead of Alizarin Crimson Hue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Flat Red is noticeably lighter than Alizarin Crimson Hue.

Can I use Alizarin Crimson Hue instead of Flat Red?

The same difference applies the other way round: Alizarin Crimson Hue is noticeably darker.

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.