Faust Blue vs Dark Blue RLM24

How close are they?

ΔE 12.7, fair: the same colour family, but not a straight swap. Dark Blue RLM24 is a little darker, more saturated than Faust Blue.

Can I use Dark Blue RLM24 instead of Faust Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Dark Blue RLM24 is a little darker, more saturated than Faust Blue.

Can I use Faust Blue instead of Dark Blue RLM24?

The same difference applies the other way round: Faust Blue is a little lighter, 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.