Baal Red vs Crimson

How close are they?

ΔE 17.0, loose: different enough that you should pick on purpose. Crimson is a little darker, much more muted than Baal Red.

Can I use Crimson instead of Baal Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Crimson is a little darker, much more muted than Baal Red.

Can I use Baal Red instead of Crimson?

The same difference applies the other way round: Baal Red is a little lighter, much 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.