Schwarzgrau RLM 66 vs Midnight Purple

How close are they?

ΔE 13.5, fair: the same colour family, but not a straight swap. Midnight Purple is a little darker, more saturated than Schwarzgrau RLM 66.

Can I use Midnight Purple instead of Schwarzgrau RLM 66?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Midnight Purple is a little darker, more saturated than Schwarzgrau RLM 66.

Can I use Schwarzgrau RLM 66 instead of Midnight Purple?

The same difference applies the other way round: Schwarzgrau RLM 66 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.