Nightshade Purple vs Black

How close are they?

ΔE 10.8, fair: the same colour family, but not a straight swap. Black is a little darker, more muted than Nightshade Purple.

Can I use Black instead of Nightshade Purple?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Black is a little darker, more muted than Nightshade Purple.

Can I use Nightshade Purple instead of Black?

The same difference applies the other way round: Nightshade Purple is a little lighter, 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.