Blue Black vs Midnight Purple

How close are they?

ΔE 13.8, fair: the same colour family, but not a straight swap. Midnight Purple is a little darker, more saturated, warmer than Blue Black.

Can I use Midnight Purple instead of Blue Black?

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, warmer than Blue Black.

Can I use Blue Black instead of Midnight Purple?

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